Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5e0d1900b3d4ff…

MALICIOUS

PDF

132.9 KB Created: 2021-07-19 20:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38df22ac277b11cfd3c2348ecda7fda1 SHA-1: 5486f2936dc08c8ce1f401f822f06b197dd0ca0e SHA-256: 1a5e0d1900b3d4ffcd3b276725b8e2b233a5dc68fb4106010395506364ac39d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute further malware or phish for information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anhuifan.com/upload_fck/file/2021-6-3/20210603190309898585.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9b7ba91204b53ea74bc1efbe5f866303/85544471106.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hs66vl1ge5dn48vmqf1lpj43lb/bivejuk.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kunimepogolasetunugixax.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xosezevusizejibiwifowilu.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/32120671331.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/483a1dfb42847bb11f05c7874055ebd3/74478782700.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/94015013000.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c549ef412ef2e5271f38c479a9fc53d1/45627004863.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/gavanavovudafetamuzozu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ba7cs3oj7d9bjec5i6cc0n6fvm/85189828086.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/85364757640.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rutezekurolatulawis.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/90693814709.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/4764426780.pdfIn PDF document text
    • http://atek-ent.com/upload/file/mekajunabibavavopitobosud.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/30495892242.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e965ba33f---31843382045.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16084510142b36---36787564801.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4e1419c0496fcd852d943961e749b0d5/38303994636.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e94576b7dd2---80573004304.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/69984272686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=harrisons+manual+of+medicine+20thPDF 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_off0001a1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1DA 11076 bytes
SHA-256: 9c8406b751162867246aede72e20f6d428bf19714dad636f07d666727871d022
font_01_sfnt_off0001bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB74 19040 bytes
SHA-256: 0c561aa77dd7faab973ea64f929dda8b23a9837f31348726a4fd0d589d20a42e
font_02_sfnt_off0001ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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