Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8556cae557cbaff…

MALICIOUS

PDF

83.9 KB Created: 2021-08-23 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ed0790abf7d92a6f8d3b6593d2b1db9 SHA-1: c8f07da30427d3eca6061b3c978be2b6e9736f68 SHA-256: d8556cae557cbafff6a752c70e8d9de8d9fe3cd90bd5caf3f5592ca2c76541f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://poolpoint.be/uploads/file/zasiwotibesukolorapid.pdf In PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dafefugigijewogulokep.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d26dc3fb5---buxixufijoku.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69645060736.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4026a96e31602ace2567fdd3e3fd5b8c/21192120636.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9bf3ccaa3---57813596700.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9qvuljoqlb0tqivt2bv5chgi20/58553537503.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607000170ab1b---95872355074.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/perejemukuzezabuzun.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/42508659023.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/md2t1vnjmsfn8shrlgs07ieald/zilifawab.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/biwuzugot.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tidemq5nguahrhjllv304dbs4h/veresokuwajifodel.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160894ddb39ae7---8087221239.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad215945f---33771645550.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/27373719980.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d5e153482020927a2f7a00ce712fde30/44077390666.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/rexabefabonesotum.pdfIn PDF document text
    • http://bscartridge.com/pic/lalizezuno.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/71857488492.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1723656e2---78029359353.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/wanupekibajav.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/3806352937.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/katewujapilogadubawopifud.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d413f2b87e---vigozew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spark+by+john+ratey+pdf+free+downloadPDF 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_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 10972 bytes
SHA-256: c47110b0597abc8f4707208af2117fc21806be412d3f3d9568b25a3339d86599
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 17300 bytes
SHA-256: 9f04421ca8add74f0b755ad5d8bc3c75b9f81369be1cf7e329fadb53737e9b77

Open this report in the interactive analyzer, or submit your own file for analysis.