Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fa70edc5f405b5…

MALICIOUS

PDF

95.5 KB Created: 2021-08-11 13:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3db5e3513b5fa3e1a08fd165e8032725 SHA-1: 7f949c5db8b1311efcf1d3d6af4ee6dc856b6081 SHA-256: 74fa70edc5f405b5aebcfcb753739e692cc39a3446d96e84588810365735cf2d
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c518bd6f42b---pikel.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e1005f2cc---1873847555.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/72643954670.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c8200dd52---33747383014.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/perej.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/15994934813.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/16ae7623a273423b18439f97a8d92217/14295856056.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/debibi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zivozujijosupabur.pdfIn PDF document text
    • https://orangerun.re/photo/files/58061547513.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pokobasebejitafojeserikel.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2277eeeeb---92287996619.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/zopigo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7b7d6b1e---18858600663.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fpqbnicl58mqej9urlcujag7c8/6388007158.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/nuwizokagafagerovu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef71eaca2---20032049415.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3e41e9e8---3951600129.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/gaksrhd38lcf881lhdid810jb1/97634790296.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210623_F915386839CB42E1.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609052bc882a4---pewivexotafopopijijog.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/rosorixelam.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/csmen8tvpeero3quplv7tkkot1/dokoz.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b6696c0ac199f12ecf0c5e855dc222ba/46351179103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+calculate+energy+change+in+joulesPDF 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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 17964 bytes
SHA-256: aaa5022060076fbb3a8165de53ac37dab7e01e15b493e6c1f39b6f890b0296b5
font_01_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 10928 bytes
SHA-256: 424c7b04c3e2de3bc557153d70de3b31ceeeaafe9f793a23882fb4ea583c7b30