Malicious PDF — malware analysis report

Static analysis result for SHA-256 a064a9d046cd59f8…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 03:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 205b56bfd8a25da69ee67036691f370b SHA-1: 54ff3d362ad33f3855c7c7011f33a5eb6597b349 SHA-256: a064a9d046cd59f8e47be905e8fb5faea80c7106e76bda68ed36cc73c81fbef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to compromised WordPress sites and using link farm techniques, suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/51d9b926c0a61bacad2c2967e6aca879/55444258153.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607111474bde3---81450748461.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f3541f95---newebexizajoru.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7cae447---vidilubunozapad.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d8cc221563c926a23aba638616a58d43/68601309400.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/jobeligugededafex.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/29769714491.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f4e1638922e3dcce07d4eb2ae3d4be1c/vorijiwopopumuludigigoko.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b3ca8a68---vetelonusasugifisu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/33d1820a1dc9688e5d815b7c9ac1167d/madavixuzulisamisivusijip.pdfIn PDF document text
    • http://medica-brno.com/files/84343493886.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lupopisupe.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/74120365629.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/34989819524.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/32134375163.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d5c8077b---55175546927.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/82837055535.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/59172158592.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8f2308f12ce61de27f91c6c7c6af76f2/kagaked.pdfIn PDF document text
    • http://ud2-140.com/files/49920268331.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f2d21e052906bd5ee475c7f204bd11c8/febotek.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c850a3c9d---49276907802.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/27687058388.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/xenisam.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/nebefu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccbedd7437---mopidusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=story+competition+2020PDF 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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 17428 bytes
SHA-256: c950d8dc6c15e7af200f36cbdee2d050fc7a6c1757a869ecb006a5cf8ceece7d
font_01_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 10588 bytes
SHA-256: 2980380ff0bdf973e7af50e19ce23d3cac03fe06eb858a3d764049f315544a23
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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