Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b1e8e151158546…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 19:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc71fe6a62320e2dd250d0b1e9b8fab9 SHA-1: aad0e487cfe1a80167a8e7b314a17d9fb65b4b2c SHA-256: 27b1e8e1511585465f8aa6e234ada0bed371767e22ea529e00c514123c1b5e08
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cephedanismani.com/images/pages/file/feruju.pdf In PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/30361682954.pdfIn PDF document text
    • https://bunianco.com/other_files/File/dunimekonosonurufesumo.pdfIn PDF document text
    • http://mrybalko.ru/files/xunilo.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/98602463043.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311453adad0---79048863014.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/f711e366a5cddbf85e7e497472b067b9.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/87728891909.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/famelixenidamed.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/82662882940.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/rozavonajajebirupo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140389330ebf---gujod.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/gejuzuxowolabaxikekubub.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/028td6r43qbpj8m4btb8te3fj1/nufonewosapamoredolujina.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/mepowebibogexuzuzimad.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008f7a10e---50908017396.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fujaruxat.pdfIn PDF document text
    • https://hirurgija.me/files/kelabasepili.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/943bf54dd87b6bd3d006dacd921a437c/83265545122.pdfIn PDF document text
    • http://strandedtattoo.net/file/95420729044.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wulaxitaguwi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/644ef82eb6cd5f242e6d780890432112.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908165523.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xogadagit.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/metusigalop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cambaddies+apk+downloadPDF 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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10704 bytes
SHA-256: e2cb72b4dd48394f9f6fb34445bbfa691202096ca1cee7859c9f54250c341e77
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 18204 bytes
SHA-256: c95d769c91d1f8c95eb4b38a97720694f42a4f5a2322872e12e1badfd9701a98
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1