Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4fa657fe23c480…

MALICIOUS

PDF

86.8 KB Created: 2021-07-19 17:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abb570b025c463fdcd78dd89b77015c4 SHA-1: c59d06ad01e73ad2fd5c572556990f8e0d86d6aa SHA-256: af4fa657fe23c4804672cb3bc00bbfe3b7aba22f6a157e18c844b92a1dfc6470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, and the structure aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1187c76eefc4f0926c144ab829475d10/35484578608.pdf In PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210530214451.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/gelokalavewuwegulurukajit.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/motufelila.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba38fde609---joxofazo.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/61388794871.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/refisosanozexuxad.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c95fa2f2e273a697989098804b01f1b8/fajinoxopexodofutok.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f106c8ec719b8ae6b87b7833e29096a6/filinetaxijujapazusi.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/68974070839.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/60966084954.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nasem.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/96755433082.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d4e4063e8d8edf13c3f9b9f0dda74c/wetotuzep.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/7033411908.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f2ecf9495ceaa74ea158144f2b1afdec/59468534506.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dusem.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/4879386715.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/35959331114.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5c3b7d08---fakopabuwinitajegavinik.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/70170075162.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85543355353.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb3388091---68324912673.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f1707ece806f77a2b51be4b27fbde669/derexopabedekelimuxosujed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cbse+class+12+biology+chapter+3+important+questionsPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16532 bytes
SHA-256: 6e09728d6680fe85436c277e1a7bbeec63c5104f247275b60852f990106082f1
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 11696 bytes
SHA-256: ce9d58d30852391b6089c61e2fc2d2b1d00eb2fa9f32582a14755e9868ba8542