Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc67a8a7ae734bc…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc5bc4fa868fda58e2cb358ad0ecc71d SHA-1: 0de2bf4aca77f1eb74306bdeeba474f6d63426fa SHA-256: acc67a8a7ae734bc9d953027dc5d6f6589eddbe4e0e0dee5ad73f14d0e57f7a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac080e5bd---76190505854.pdf
    • http://instandee.com/Images_upload/files/kebekivutolivobewavar.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3922394862---75636613035.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a4806a67adf6d164d7cbeca377e20754/fixabakal.pdf
    • http://1careglobal.com/upload/files/89491749779.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970436d2ec6---suxadajurogoronuraxila.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bd895d3fae04b0ebfab049c7da1d9b6f/xawivuf.pdf
    • http://computer-rudolstadt.de/upload/file/3720376445.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3dd9905e---79888288506.pdf
    • https://apotekatia.ba/fajlovi/mediwibujuxaxarasamub.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6250127ce4---88292726702.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4930f75846e9b7bcc64e3b53a3e84c32/bogujofizegiboze.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/933773347700c6984690560866929027/48576406492.pdf
    • https://scriptdd.com/_file/file/21991619347.pdf
    • https://yorapp.it/file/42478097721.pdf
    • https://laurallo.com/ckfinder/userfiles/files/xijexawasenexevifadu.pdf
    • http://rkmaster.ru/uploads/files/nifupexuko.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/rukozitobefowotirejeladev.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ee161f61---53903467073.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecd6bcb95---76297561207.pdf
    • https://arhometutor.com/userfiles/file/76276719681.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8676b8102---paginexutomolit.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ntfvvjgf93nht04fts3klv0ggj/33739685555.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=patience+in+malayalam
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c0.bin
fb58b739928c00f35f8f4b1bdfc9bb51fc3dc5358811b7de83aeb16b2b1ccd3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 19480 bytes
font_01_sfnt_off00011962.bin
fd12ea715c2c47946132d891f48b23e98b5b63f420ec336df181c50cad25f6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 18352 bytes
font_02_sfnt_off00013676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 16792 bytes
font_03_sfnt_off00014e8d.bin
c4612095422a799f6ad51dbcd0905cd954c48c94d9249901fd26f0b8f9bbdcf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 10120 bytes