Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf9b6faa2885d84…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 20:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1cd7a5739e94c287d0bd1ff123a6d587 SHA-1: 090d2c5ff81aeb7c40a7b8797f198d5c916eca28 SHA-256: cdf9b6faa2885d841c17090dc8929408fb88c6657bb0e109b070786eea2803ee
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and ClamAV. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/995d14bc33cff4152b8f2c1a12040aff/83397575409.pdf In PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/73022072263.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752df70b2a6---54809945727.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gagisibem.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c56c429e24522181865faf5fe156d6e8/94437768052.pdfIn PDF document text
    • https://tigaintan.com/contents//files/83696745175.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xekigitazikipit.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/45271306512.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/nuxafivuno.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5e71475c708c41b6501ab539f7eb2d62/vemikovofi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c082bb5161c---jomef.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e8a70a7aa62794b8ee34045ea7ff94c1/27591186813.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/4083334596.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/96752926174.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/27701534310.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xogiwuvozud.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1a8423040c3e83b8b573b6c859766661/88864813954.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/19303104731.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0d1u9mmcaecj0dcarp0s3k7js/35118400306.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tufizewegirujo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/38da946fb5e21ee51416480b45fd3428/84184833966.pdfIn PDF document text
    • http://119pump.net/d/files/60828255356.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608138835b8a6---mapevima.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/91039979614.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dac68f7c3---lonomuxonukelixufori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=los+guardianes+de+ga%27hoole+el+viaje+pdfPDF 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_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 17992 bytes
SHA-256: 7278f2edb71a567d7c8d7a0bb6b6b7dd9f540416c707f573784f3b0b3306646a
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10968 bytes
SHA-256: 550e7e1ba482abdb4f72e50ece39add7ee2ee784ea21e918ec76eb2fba14fd39