Malicious PDF — malware analysis report

Static analysis result for SHA-256 317613e810abff72…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 19:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5efc870e5f4fe00eb006f88134aa04a SHA-1: 53c6792770bd8cd2e4e7680cd8fb33cbfaa19952 SHA-256: 317613e810abff72d0114ff86565cebd49f0c37ad81522296e640a18d43d3b6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple distinct hosts and the 'utm_term_redirector=True' flag further support the conclusion that this PDF is designed to manipulate user traffic and potentially lead them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://chongros.com/userData/board/file/14352696874.pdf In PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/89994158570.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xumaxamafodosezesov.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/96464721179.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210915_5ABE6051CD49935B.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/jukogirovujotemapokuku.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/49583834183.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a25d03e7b---83545778909.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/dibagazunowufibu.pdfIn PDF document text
    • https://salonrewards.ca/images/file/tusifofedozawazowixuwel.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/28342399075.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/rugalagudotikuxadokotux.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a37ee5a8c---sojofipolezu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613324ca71602---1917491982.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/biwojesedadez.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/rosamejotuduxojetal.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc03ae1709---60467274346.pdfIn PDF document text
    • https://wsbtitan.com/images/file/1118108251.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/neredujikiret.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/94162769480.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/69303898014.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0d90871d19cfc11b105bd7314ebae9d/xujozanaxes.pdfIn PDF document text
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/46911223040.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/42863323269.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fuxugezaj.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/risinivizunelifepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=swords+and+sandals+iiPDF 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_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 10172 bytes
SHA-256: d97f3d36a16fab71fe3ea79dc1c57df4b52fd9e3797ccc5feba9c7b3ef6a6d7c
font_01_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 17184 bytes
SHA-256: a1846407ee56bac1532267f5ce535a22d9f9c10d4dd47e680d9f682d03799fb4