Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b063e4d404a3838…

MALICIOUS

PDF

84.9 KB Created: 2021-08-27 18:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0801259bfec29c97c787b8749a4713c8 SHA-1: 84070ec7802175730e4d263ada56add5bd6727e1 SHA-256: 2b063e4d404a383862b40565dd04c7440f19525ec8a848024220519dae9e3182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1953e5bd9eb3c357dcde4346ad5e4a0b/guxofonanerukerowaru.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qvg4rsvo4r79fjviqiq6op91o1/94609599501.pdfIn PDF document text
    • https://austarpharma.com/upload/files/zogunedaferep.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c204cc4f9e6---diwumojitabawe.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/2672495683.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110c8685c37---zorotax.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8ab714c675ee4246bb2c05b4f84bca05/gulivelegijuzotuf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071991487c4c---62920831990.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/81971469055.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/fifutu.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/mozinafamazokepifibezifu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf13839ee---ginujusugodawekuvez.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/mesomagilanusef.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6607e3c8---xipowegutuxusewoduwutiki.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486da759f0---mazowuzojuwugum.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/wisewo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/zixabilitiwuwagikit.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/rilobefovazazaxozaxuji.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/80b4051d927efd8f4361c732ca2a4462/jaxivaguxorinar.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/82726898986.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bobatubuvifoduwin.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d715d374b---23305884743.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/95197877389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fs2+episode+2+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 17196 bytes
SHA-256: 5f0a4cf0b222990a74eb79ca7c611d5465ee7cf4199aa2f68bc5bc090cc64e65
font_01_sfnt_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 10424 bytes
SHA-256: e56363154eb3e789b3de701b3748ead153adc7da18a99de8f96ad511a9e08fd9
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1