Malicious PDF — malware analysis report

Static analysis result for SHA-256 668da7ad948c95ec…

MALICIOUS

PDF

97.6 KB Created: 2021-07-07 00:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06ba8729d91703b8be76242adeb9a860 SHA-1: 8a3ee4170db541c3e733df9a254a69034c0da6e1 SHA-256: 668da7ad948c95ec613800ba68c2c2b03c26a7f99bffe4efd2db80fc10134775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://artasedanasingaraja.com/uploadfck/file/58402911247.pdf In PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98de4b894---wivaxodefadurobavamegaka.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a6eeb477---nizejogepugenut.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/43740b9386054a814844edf346a64dfc/banevevoxe.pdfIn PDF document text
    • http://kco.su/userfiles/file/lobabotuzapujuzumosili.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a695ad05c---goriwabe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/jurogifiwaxeva.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/54218576336.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/30899518095.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ooa7fhrm6qbamv2vpemmtr8063/38788463908.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/17971232981.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/reduxikojiwiwaf.pdfIn PDF document text
    • https://lemanssrl.it/file/26232349615.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a7fbcc1bf66d1a2b772c57601307af10/2941197611.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/jopixufubejo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/61471545388.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b54d1a7fd---silezivizuwixivaxonudup.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/525f2b429e4f0432c2ee9a01c103d531/73228023980.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dutojavagomu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/96663369524.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cfaacacf72f921115b8a59cc9e3f2836/xamomokim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=repent+from+pornPDF 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_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 17252 bytes
SHA-256: 7df8668656cfc81e419c7357d973d3b6973d22c349281d3349e8c22a7bdc8b63
font_01_sfnt_off00014990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A7 10096 bytes
SHA-256: 20d3bc87e02bd9d5cc82234163685b57376fd32d9305b3ace74ee5aab4ef8203

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