Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab2bb94bf815cca…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 21:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a9555f467fcb396e529f6f776d8dec2 SHA-1: 0081f5a765d55986e61959e2f4facc9968654eaa SHA-256: 8ab2bb94bf815cca3b1ed1253a043890d998cacc8553b0c0e08bcc15f5ea075e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and a phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggests a link farm designed to redirect users. The 'SE_MFA_LURE' heuristic specifically indicates the document attempts to harvest credentials or session tokens by requesting MFA confirmation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://fortworthdental.net/cmsCart/upload/file/vumixenos.pdf In PDF document text
    • http://kaymccarthy.com/immagini/file/pebirusevagebutujurugakaw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.pdfIn PDF document text
    • https://salonrewards.ca/images/file/japolowonitiwe.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/42205689215.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/suwuloluvibadofus.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/78913615439.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bawinepogutizozapamidixuz.pdfIn PDF document text
    • http://pactolous.hu/upload/file/43993683548.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/gedalivigomonoxokab.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f64778fbf00a6153feffbcf1c6d0cddf/wigekosafenegunivoxuramuv.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630654236.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/lurifixom.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/gedelerokakudopufer.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ed509785---vovumumosoze.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/nowomofisejare.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/fanapaxin.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/pepifap.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/49439240621.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210916113406.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zenuj.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195148558529.pdfIn PDF document text
    • http://rnralpha.cz/res/file/dawafeturamod.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/52030496586.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/puxojujejazose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tomato+vpn+vip+modPDF 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 20084 bytes
SHA-256: 6aa765ddf1c2befb8b8632101508567c5797dd5349b568f461f8a287a8b96aa2
font_01_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 10136 bytes
SHA-256: 62dbedfe20d2abb10493a1f8ca97cc7ea35fde0793d97308ed5f113c8e7be0ec
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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