Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f14850bf402312…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 870b7d6a2c3785787e7fad788e4e1249 SHA-1: ea5768e8d575dc17699ae613c3079a8495098100 SHA-256: b3f14850bf402312c9eab2a48e4c29880636acac78255c625d87e42cb401ec19
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external links and the high risk score indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://abovomedia.hu/_user/file/91260277415.pdf In PDF document text
    • https://myparrotfood.com/user_files/files/nibafumonukogilarasukazo.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/74722298933.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613328b058e12---3919031234.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f294edc23---33694520289.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ximazedetip.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wenelavanuvasep.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210911044720.pdfIn PDF document text
    • https://rubfila.in/files/file/77297745951.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/daa97de8bb4700d8981ba54926dc5f6c/sovulamumidomavazona.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/63890655271.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/13119789004.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/sajedebabusatimezapivop.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tafadopewikek.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/25253474861.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/fupesesusewebixurolofel.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/87981916624.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/zitowoxiporitipe.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wotopabotakumekulodugawu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/lofifupapalijutapite.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/00aecf77fa4431f80fd34ba436da2779/devudatasumin.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613857ccdb925---bewejakopamoxotis.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/344609576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+cp+call+of+duty+mobile+no+human+verificationPDF 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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 11112 bytes
SHA-256: 6842fbccff309adc6e4538af1d93d5dfd7a55b4ae3eb83ff43fb291763b28611
font_01_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 18036 bytes
SHA-256: eaa32aac0beaf9aa9a6fc63ceebec707d307caffbc144f6afa74fb4a5076c303