Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d4420ca22db81e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 00:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce6e64a6af0a6e1d20873495f690fe65 SHA-1: fc286356c24d2f3afb9e8077f00b6acb9dfc7787 SHA-256: a4d4420ca22db81ea567d0bb6aa262ebbee6f3672aba0633f9185eebbf9cf62b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, characteristic of a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic to bypass gateway security by encrypting a payload, which is then decrypted using a password provided within the document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://55pluscommunityspecialist.com/userfiles/files/gekuwe.pdf In PDF document text
    • http://yao-cheng.com/uploadfiles/20210911201956.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/78771576197.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4df9dc7d5fac4a1b0ba7dc9e59f4f0d5/94787168711.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/wefiwejexumunegefifo.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210910_142536_194.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/15617409329.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/sezavagomuwelabamonamotaj.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/jimisokimofadoregakoma.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/sawotibijizotigexudomitad.pdfIn PDF document text
    • http://vucert.vn/uploads/files/3805669001.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e32c81d334ff508e16ba1f6e3e60256/mofawozepidubeji.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/risetufowumetokel.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/97545244041.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/bidagezaxujepajokekew.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/sasagofifupibad.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd498c6ba---21046643086.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/webelib.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/zevotemofi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/98371941326.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/15684003278.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/48039372814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fortnite+accounts+with+renegade+raiderPDF 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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 17628 bytes
SHA-256: fa780d2f8cd63efb31637646ccfb5c2f97e2d19f34e580be514bddc6f2f64e7b
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10872 bytes
SHA-256: 48cf4f45104daca332988b0fb5f047bf8ad44e65b28c3579f55eb3856b6bc2d2

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