Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ccdd96eee53541…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 03:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8546158b5cf48ea788f03f5a61c728f8 SHA-1: 0acc7e0c0c669e45fa436df135f53d7d8396b7fd SHA-256: 77ccdd96eee53541e77d41753e4ae567757b5594f23fde30928233b8e869b3cd
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=best+photo+hide+app+for+android PDF link annotation
    • http://jewelry-shopping-city.com/uploads/files/202109041648358617.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/wawivop.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/miguro.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/zagupigaj.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kezagiremufevaki.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f96ee1cc---17291439395.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/65533863937.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f3e2de6d---39097876556.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/34509688467.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/32817802506.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/saganabuzevonodajirure.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wozotawijuvogudogolarevan.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/75996592365.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/ninanuwojazezevog.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/56209878698.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b56d7208b7---51819031903.pdfIn PDF document text
    • http://shamayachts.com/upload/file/92972101132.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/87401001160.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2accf42d2a982b8616d7351bb5d8671c/48467960365.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/tokujepugu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/fonagubuvokotufakanaw.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/35667409890.pdfIn PDF document text
    • 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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10600 bytes
SHA-256: c671a13f929335139dd0970a6360221cd711e28a8d07ff6763a63609e8a9e1c0
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 18128 bytes
SHA-256: a867245f77fa846a3ebcd58b5e37347c99abd038bce7decd49a41a7670640748