Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4ea457445cdad4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 17:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43fec7c25ebb909f980222fc814ee284 SHA-1: 34a3e5c5c4f9ff8ae8b411e9e5dceb01cbb954b2 SHA-256: 8d4ea457445cdad4ee342a2fafecf40c264d36ddddbfdc09897b78e07f6537ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The primary purpose appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=cool+piano+songs+to+learn PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aba33a141---xubevivenogamemenunob.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/pitagafotobitonuto.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/bebutamufagurujefa.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c236eb74a3730c7405fd5a4023bf87cd/nimupe.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pudodidobapudazejujozekaz.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/kebafokamuwotosegazejok.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///tujupirutonope.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ac041cbc---16427294130.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f402f9705d---60915586387.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/78451689093.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b1cf2532a6ee3a4af917f5ab4620fea3/58889174510.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077057183396---duwabenizutubujux.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/61746574086.pdfIn PDF document text
    • https://hirurgija.me//files/24337711348.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6f4614ea---tewizanuxazogazar.pdfIn PDF document text
    • http://exima.kr/userData/board/file/somagamokusagofosadilo.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/89c38f6dd8d884540f4957b4da19e871/gilokepamuro.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/61030705476.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/64467720390.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bd8fe4ced76c39b074286c2d003eba67/fuxolalisexupivenurogaje.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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 10460 bytes
SHA-256: 174791aba6ed5c8957e644076d92f656fdcdedf829be251407843fbe6e58482f
font_01_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16448 bytes
SHA-256: b56bf226310e1828333f02f3f73ad0c013b0003ac7a9a3a362bc73d6a4fe6530

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