Malicious PDF — malware analysis report

Static analysis result for SHA-256 844981fc7bae4f3d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 12:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 916ccddf9014d9bb44fd8bd1a7d99d7c SHA-1: baecb3592f4921afdf81fa976434b4530661de9c SHA-256: 844981fc7bae4f3dc2a034887754819a620e237fd0f2a1044acbefb5a6baf5f0
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The document body was unreadable, but the presence of multiple unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00e660584---zudifamokoz.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/muburafujuwuvaronox.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-19/20210519235220165497.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/gno20bj2qq30cc6nqcuk8hilq3/pususiwazizofuzewuviwali.pdfIn PDF document text
    • http://faradbox.pl/files/file/tixanupixukamosomiwuson.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf0326be9---47688385707.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832596f0e4a---46760837575.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xixevogemoleve.pdfIn PDF document text
    • http://chinahongji.com/d/files/88023357084.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/8214758843.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845a8d646d6---xifalubafolo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970649b94f2---93234941439.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2ea4p334fgpb3n9gibohv8eo73/fakavoxidizererorevubof.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/98266277100.pdfIn PDF document text
    • http://billsky.ee/files/file/tujesasoluradatope.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28m4d8ot3vfvmn2aht2acue1lm/femitiv.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/9649060000.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/sugegevofomududunotofipu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/26453504469.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5e6784b87aa1cab3f1227e321ae50f8/tazemuro.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/amksne0dtr60udtrovfusmclnr/49666763572.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kobovajafanalofosiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=le+druidisme+pdfPDF 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_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 19136 bytes
SHA-256: a213e2e72e2fbe0bb192bc8ebf75f6ccc7a62eefd33f72cb8cc6141f01486533
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10188 bytes
SHA-256: 7352ee4cbc63ba6153d9c49abac189b913b3e3e9faae359bfee8f1fb77b6b20b
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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