Malicious PDF — malware analysis report

Static analysis result for SHA-256 304b58d4cbef6c9c…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 04:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c7d95f733c188953e2c4bcea5fb3f826 SHA-1: 1073ae68283cb93202903867965255ee2f63ba91 SHA-256: 304b58d4cbef6c9c1f4b54fe1093c2529695a0fd1182089c6cde0f1d6c45f210
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The presence of a 'Password-protected archive lure' heuristic suggests a common tactic to bypass gateway security by instructing the user to obtain a password for an associated archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608551ccd4bfa---togufapupinotapavudomisag.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ltrjl73997hc8ok7o5mlurh4u9/zikupewu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/549155ae54285a4a3f26b9f1403ae7f4/17844305903.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/41934470396.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/192649164afc8bedf6ad9eead4b425bd/sipalesozisutoruzovaxero.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/cdde4eaf1fbfbc4fb5597f2843bd0ef0/48036043503.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a9e1a58c3e86f519ed05873305e29c7d/puseginikusudagilebaxit.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xafepulij.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nuxizari.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096277ee334d---28450454597.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/24035754522.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/516169122203cf9d99b1fc1bef895829/zeletimetogevosatami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7997e1f45---38968929144.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ee7b2c15410e900555dd0d7a3818cee3/82985994871.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/975fc3a380cfb84671ba966efc1f9cae/65414113440.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c07f2fed4---dotevikonowunowera.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/13150592223.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vawibaremexeneb.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071779dd19c7---jefawizilegidevodebiw.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/96ff6c63d3e9a218056b530ec6ff0b1e/9908086907.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c439355cd8b---95284347751.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/93d1afa150e668ae8aaf675d296ad442/laregapefuxapebedepewom.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/jatote.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9381dff7---71633011630.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8200cf2355b7af11f42b4dbb9461d1e6/zagerevazedufijiram.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/3502380367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+say+pickle+in+spanishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 18944 bytes
SHA-256: 31321eae8e197953d2c9918b50b16c13399396e90341a9afa2b4e7eba07df2f1
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 18228 bytes
SHA-256: 3e35517cfe9fa4d511f17977a9fb7ddbb768c194617bfbc7e6da082c4680ff2d
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14963 10796 bytes
SHA-256: 369df9b64aad94d0bf7e65eb8566fb17c71d80624d0b5d93f97b6e6b5e2046ea