Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1f857f08e9ef54…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 19:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51036a101143843f68fde27c4f23784f SHA-1: 6afb8585f36bc3bbc8f9ff20f0a186a9e6fb3553 SHA-256: ff1f857f08e9ef548ecd22207f0f585862ffe14e081143cf08cbef6d44b16eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/20cfcd9643488efc6ffbc6cb535887e8/zikovoravu.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/674319f0ba29efefd3e88fc8f7a24a8f/malutojubev.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/58738809326.pdfIn PDF document text
    • https://e-midas.ro/files/file/44367765169.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/8643070586.pdfIn PDF document text
    • http://masonhn.com/d/files/77215887811.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98072936848.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2db10c55---43192863993.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/19256870840.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/21251678215.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/14009301616.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/4127523352.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/47143218433.pdfIn PDF document text
    • http://dmkert.hu/files/file/rufavenesajepaxuduparubob.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_150028.pdfIn PDF document text
    • http://altinay-law.com/images/file/93637083709.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/4590278813.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/92104699323.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gulogokololasazomefugaj.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/95381931163.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/55617030743.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tenigu.pdfIn PDF document text
    • https://inks.bg/userfiles/file/12797976446.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/14417652415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=positive+words+that+start+with+o+to+describe+someonePDF 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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 17484 bytes
SHA-256: 0a2ba6ade7ec50c2871b5ee7ff25d5e931cb25548defbfb8059b8ac14535153c
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 10884 bytes
SHA-256: 30515779a1bc756012d312a3e0e3bf35efcaaa80fa6195a25bd3d742966d265f
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1