Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1535e95320bb59c…

MALICIOUS

PDF

85.0 KB Created: 2021-08-13 07:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3138754f0c1443197bf0412699360647 SHA-1: 573133ad7b31137cb70a9cc5acb8c719bc5d8b3e SHA-256: c1535e95320bb59c7ed29a3d535bdc48babced6b7ba4dd4b716ba0366c0e5cff
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bestofbucerias.com/upload/file/davikukajuwakedukiguj.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5bf9e117---72343756320.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/3860987364.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/803e6ea108792efd5bf84aeb68a754bb/62073520949.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/13411210191.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0dece728---fagolakuwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4399e09c01.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vojesikobenupudezat.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726d77afea---getomuxasoma.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/wesuna.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c42c09fa17eaf584321ff09e187e145f/tifojoxomepegap.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/70274418068.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/wemasakuzujatakefodixir.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/454cd306f4792e64194f65c2bccd5eaa/75792412108.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/lewexebosawoxitikuloduze.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d59a800f31e56e72b8706d79e793d02c/52460050178.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/konabovukiti.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/78338694611.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zevazuviwefesebix.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/65027388320.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb24d9fff2---folitaguxukatezuxi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5f3cca3c7c943aece574b9887545c105/52775748751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wal+katha+ammage+ashawan+3PDF 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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 17064 bytes
SHA-256: baa88175acd72c2cc9754c6c9536d14ac90e19812956f25d5452e01bf9c8af56
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 10584 bytes
SHA-256: 22c62b30fc11bb6eaf4c3d66b74999438f443d11ee3d95e07e95e78f2cbef8a0

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