Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a266925da77b412…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 14:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b11882175cd618973ac9e90b9f787a75 SHA-1: 15b1fdd4a0793955b99ddd5b27a5d4a58fb3f7c1 SHA-256: 1a266925da77b412e414f4ad8539e254a97650c0481d9bc9ed5ca9196022daa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it is likely used as a lure to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=state+machine+diagram+online+shopping+system PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981475392---85836036251.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/46540720345.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/33982672773.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b48afd50---65755599918.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/757083779.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/hnhs3vu67vn7ugevt96tva0e37/sewurixuxedexisu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dumugodutagik.pdfIn PDF document text
    • https://stopserv.ru/files/file/lorura.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/25938901528.pdfIn PDF document text
    • https://mattress-leader.com/media/solifemajigowakigatabul.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782ef5427e3---38968841594.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/4335803.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070241113990.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/jibawidavive.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/95384273770.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/91616096082.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607981a88cbfb---jediz.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/20879048006.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/gobunanosunow.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/12211327753.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610782a28711d---sanemilakeruxafuger.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/xakajixetezavuparoge.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/n067gq6f0lb34dl2co6hkk4vnr/42174697502.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/46688060062.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/77428731636.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 11148 bytes
SHA-256: d7fae4f7af5de95621c090bd17720738c7cdce9d066ee167b1e0d159aeeaeaf0
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 17284 bytes
SHA-256: 6d4bd9a30bfb5a5da62392075fe3de96c04c47a0d62e3368f5e9a275078e693f

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