Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ba1b8ef8588696…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 22:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 285b7cca670c4e4fadccf884c1429a5a SHA-1: e7586a127cbb7e82e06b378794e94c714e480c21 SHA-256: 42ba1b8ef85886965804f17cec123be64fcf76032e4ca034b3adae663c72934a
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39785554701.pdf In PDF document text
    • https://driftwoodcc.com/userfiles/files/43623398338.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tp36r6lbogf6kc2p0rhtb797sf/12859067670.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/82664971538.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/mimopufojamepinovel.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2e3fe0459dd5ae456bc76ca43f585f2/54913689212.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/nugitonize.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecb767852---xevuketekefiwoxedalilu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/dijivujumivokozem.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607758bdf223b---nanekoxabosusunaxewoxiti.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ecc61e8584c28adbee3268c813221a47/lelimudotinevidipifowudur.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/20169398050.pdfIn PDF document text
    • https://saam.vn/images/content/file/30203074036.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ae96eaf37c8bf013c7b5a8dae18a188c/11187368506.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/gewuvodutupibi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b78a5cfc---93621345405.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/povig.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/44888748460.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fevunamaxavupikiwe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f57828469---bukekenexigafotodi.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/61498695272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=field+hockey+drills+for+juniors+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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 18656 bytes
SHA-256: 502e0e9f098fc6bac945adc3af2ef4ae993cffcb530b2a410a86804b23ad8b4c
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10868 bytes
SHA-256: b6c274c64c74cea44e07a2390c0a1e615fea900dd39e6080273e1635c066bd06

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