Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffc8386b67a1c5b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 23:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19bc2285dcb90967ab773ac3de7e2ebc SHA-1: 59f108317dc6262f935a1d42e8392cae10c9e8f9 SHA-256: fffc8386b67a1c5b69131ae9a40f24adfb2227833bb54cd973484b325643f16d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on directing users to external content. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=triglyceride+metabolism+pdf PDF link annotation
    • http://allamericannursing.com/userfiles/file/vovamalugumux.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33846987683.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/94513836296.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c37136417e1---sifuzisamenuxinapa.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zovegaz.pdfIn PDF document text
    • http://chromatographvials.com/d/files/sofove.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0526484e8fb88e253fa7be14771665e5/97802420456.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/gikemimukazakuwurexu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde168a799---87798156976.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/nonawowetabonoxun.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9889fc2a---82726413357.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/66433744681.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/11dc44a73e42d4c678aa06dcbf82cda7/70191956818.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8ff7f415---69694979758.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/30841838826.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4e991969---41636151429.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/7656145730.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4530b1862e75366bd109531b29814ded/dosupatomivopekiv.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/98556124659.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/28783038973.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/30453366268.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d05c6f30---zixamujisuzuwi.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/75220906726.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/vebixadefopomurizig.pdfIn PDF document text
    • 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_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 11076 bytes
SHA-256: 54e2ac8ea5668c0ff7793099233487e68ab72f63069acf6a45973c0d55c13e4a
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16964 bytes
SHA-256: 13a9f9785bd23917451f8e713948e408c1a56c1fbea92d12404fcc4b4dc50424

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