Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e38c2b03d400cc…

MALICIOUS

PDF

92.8 KB Created: 2021-08-10 00:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c7477dd8f9e1dc813f4145875f0004a SHA-1: 26eb2979123d2c7d4b3259bb7746be5358f25317 SHA-256: 19e38c2b03d400cc351767bd8b3d0cd6fab27e32a29d77cc0b0f390fddaa5150
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users through a seemingly innocuous document to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c9216b18a73964b9a92492a47030ef1b/pafugikepaselaviriku.pdf In PDF document text
    • https://congchung7.com/upload/file/283136257.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddd2780f6a---92484978914.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bed2bf21---nujexakanaxipovalen.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9d69223dc81fd80ab4f3a8cb79fd82e7/5459167754.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/mizubavezegirizelubuw.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s9vs95jvidee54mqhkbavgehg5/86663573603.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/28967a89c40f3cf700620a78667cabfb/tebewudorifuli.pdfIn PDF document text
    • https://digireg.se/upload/viteki.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/67190108348.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a188f707801---70656478579.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d62ef042662bd4a5d602bc8d3e8a39fa/92462794397.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6o4kkfbep6gm73av8mr4co8gru/zakunepepuz.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/76897359818.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/14020764705.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/76346110482.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021072606323180554.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625227702.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6288fbec35556ed4fc868a6fa490f13a/bufarepebupa.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/sokexilireroruvawud.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/naninibuxafovodejupazovo.pdfIn PDF document text
    • https://drlanda.hu/user/file/47628585965.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef229090d6---47480899633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cambridge+ielts+9+reading+test+4+answer+keyPDF 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_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 11180 bytes
SHA-256: cf85ba04d89f4d6b4fd61deb4a346102bf032dbfedde73d75905d14bb3ae046a
font_01_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 17508 bytes
SHA-256: f86b5f13bd884e07919b863c0f586e93b08fdca535ebedee1c08579e96369ffd
font_02_sfnt_off00014b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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