Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba934f330e217317…

MALICIOUS

PDF

88.2 KB Created: 2021-07-08 12:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a47095dcce895431bdb4913a5b4b91f2 SHA-1: 174a8473f1baaf0dd604ff9cf9915473c43eea6d SHA-256: ba934f330e2173171e72ce2ec34028cb6ea6c98640691b913661fbe9b8a7ec80
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, a common technique for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://clinicaveterinariamontecchia.com/userfiles/files/84774982778.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c621bcbab0---66296473616.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8b12c75ec9b77a281094212e20cc2a9/tinixinavaw.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6ab48c209eb93b33c185b5e78ce0fa39/lorolabazuw.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49762b8240---44435899237.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3575bad032317f4302b57ae5e5fbbe1e/1670083646.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3f0f20dff81326bb731072af095c8d44/8002757688.pdf
    • http://surmounttravel.com/userfiles/files/wimebuzifikot.pdf
    • http://monroehighwildcats.com/clients/40160/File/jonakozodavuzovawijin.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g41pfrehimfdp74p11fpqnbsk7/93926895899.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7f5ec6732a8ef7db31dd364dfeb272db/72531271386.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pmo9no089g78nq1l2trltt7t4c/53008121069.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/59b872fd4b14d5c7fe83ec868a2a30f5/12802048036.pdf
    • http://bydnjl.com/userfiles/files/6399011741.pdf
    • http://offerseir.com/basefile/offerseircom/files/bunokitosexiwimer.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f5431cd7---74889962639.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b398d8bec0---taserixobilubiretusi.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7f700ecf---9923216059.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e59780b6351---72012663280.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1795e096c6---wufezan.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/putifolazuwalo.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f737c03f38---bimagafum.pdf
    • https://moto-trend.cz/public/files/fck/file/60214568260.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0e3s1ln7k91vjiran5btcmglnj/65508831819.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa593a3e104---wofonomadudejuzobigajiron.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091906be1a94---ziburovenogufutukozuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=latin+word+for+duck
    • 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_off0000f251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16792 bytes
font_01_sfnt_off00010a63.bin
41ee8aa7e9e3e5378c71322a6d495cebba0c70dddfed2938fb6aa5d7ebd18a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 18700 bytes
font_02_sfnt_off00013a89.bin
4547018d280a9343d7cc3a78f22fdcf8fbe5a1b0171bdef20e29fbcdf68b5d78
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 10356 bytes