Malicious PDF — malware analysis report

Static analysis result for SHA-256 3216077af4b87062…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 18:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 691ee0c951d8e32d03dd132dea6ff46b SHA-1: 887fa0f9aaa66ab9c09b6d7d9a27bd624ec89ca5 SHA-256: 3216077af4b8706247026d5ba6d9e9484072a752678928ac90462a05ca0039a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ohmamakitchen.com/uploads/files/lefavinisibigebetezegova.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4om15urju26km6us59ap1og832/robejonijejudubi.pdf
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdf
    • http://solartgaleria.hu/images/file/16807939237.pdf
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/lamakatitabunifilipe.pdf
    • http://pandoraecza.com/genelresimler/file/3666646137.pdf
    • https://caror.hu/ckfinder/userfiles/files/bekiwajatikepifuw.pdf
    • http://www.wiz-fac.com/uploadImg/file/nevebofofudugisa.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/48380806916.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/vibiziwitozarozodix.pdf
    • https://myreply.mobi/snappshott/editor//file/10538577696.pdf
    • https://sicurezzaips.it/uploads/file/60774676027.pdf
    • http://oasis-inwaste.asia/files/file/dekafojubufadisibenobulu.pdf
    • https://basealimentare.it/webroot/files/fck_uploads/File/54792701004.pdf
    • https://pachetedeturism.ro/images/files/26465531763.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5elfueuf2h7cvrh4jb4jnol846/rudupawomar.pdf
    • http://casavacanzesanvito.eu/userfiles/files/gujijopug.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/reguzavurinupaxo.pdf
    • http://vipacademy.org/userfiles/file/toxijovupogol.pdf
    • http://turchifiltri.com/userfiles/files/fotuneluzug.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/fomazoweluwokewidusafeto.pdf
    • https://siriusdynamics.com/assets/uploads/files/mekutoxavufuzogenal.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/93294812147.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161506fbd35c4f---zatofemusomabinegenukilol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+open+zip+folder+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d8.bin
13b83c748db0a3144e99172ac9f076e0f7ceec0168cb1e0fadd15165f061ac84
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 18380 bytes
font_01_sfnt_off0000e612.bin
1ef7540beaf9081bd58ccb6261c6f8f2da712c93057bd7856929c67abe9bc3d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 10460 bytes
font_02_sfnt_off0000fdf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 16792 bytes