Malicious PDF — malware analysis report

Static analysis result for SHA-256 76332f4e59108bbd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 15:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee86f4fa2926b63f425e9b9402b97fc4 SHA-1: d3034307603839cce7cd51277864c8f596d95ebf SHA-256: 76332f4e59108bbdbac3bd2210ad34a747eb814fe86f8877ac5180ad8afec03e
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 domains, several of which are hosted on compromised WordPress sites or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9e11a52863f6aae44c8acc00d073d84b/12419698026.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210917182558.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d99f871437e448e37057954ab72641de/wenagoruk.pdf
    • http://3xlove.com/uploadfile/file/72419513020.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdf
    • https://oncetrabzon.com/resimler/files/67782057567.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/39382493894.pdf
    • http://digilit.ir/basefile/digilitir/files/pewufaletatajunex.pdf
    • http://www.ezmoving.com/file/67920234949.pdf
    • http://friulanapanini.com/images/file/65337369619.pdf
    • https://portofcrotone.com/dati/upload/file/61840951422.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/73514993950.pdf
    • http://szjwwj.com/userfiles/file///gibatubisekogutunato.pdf
    • http://www.logomarcanet.com/userfiles/file/kikunobomudowunegitazokof.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210911_358EDAB278A24850.pdf
    • http://zovsh.com/Uploadfiles/files/pinizorokilizewowumadonaj.pdf
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/doroxifaxepenuxet.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d8f535cd0e7d11a2ce01619d534ce4f9/17951694119.pdf
    • http://tradotel-riviera.com/file/femagizumuxalig.pdf
    • https://gdaniec.com/upload/files/bonurotezegoguk.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/58314704421.pdf
    • https://speakingparrot.com/upload/ckfinder/files/54539444795.pdf
    • http://robbes.nl/media/files/lamatixazamadiwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+i+get+garageband+on+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_off0000e1f8.bin
9b68d2848030220d5631bd825f14c0743e2473f4fd1c19da9e8323ce7680ba04
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 10380 bytes
font_01_sfnt_off0000f966.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
font_02_sfnt_off00011178.bin
b9f7dace48edd5fe87cca5059fce9056acf069dc136470945e040f4fd9c49205
pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 17960 bytes