Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b571c0776fc31a0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 01:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87a18b8603b8f73ab92786b77bfdaa4f SHA-1: 130241c3af7a2b0890e92ada77d5d05b4ea4d15c SHA-256: 4b571c0776fc31a08b81c55d049a6f7f6a5eff1a04a1aac1ee49b25c6556ef0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://interior-mark.com/ckfinder/userfiles/files/duber.pdf In PDF document text
    • http://riversedgefm.com/files/file/mamopevibolorerukox.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/96086157553.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/68526030346.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kevet.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/wafep.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/wunodipaluki.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/xigasazikirusa.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/34311749114.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/40628131911.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/mapili.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/841f00b0196de817069c27fbcaed1381/mabizora.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2d2de68d---16438140247.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/15057495117.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///92975995308.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ca6aed79390798d2e1bb7159be09cb9e/donanugedubowojukesinon.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/77488419866.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ebfbc3588723204057bcf38a1b5a8462/78145467149.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/87093063216.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/2775670516.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045b41426a---37891620544.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5ac183c3---xalenadezoxok.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6585ea3991---sudewanof.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/xasukuposigarakoro.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/de07fdf9359734861a19ca39ce5b3cc8/gonorewevasepugeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2013+ducati+hyperstrada+owners+manualPDF 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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 11448 bytes
SHA-256: bc7da4b11f89b0c646068aa8a4d68df70ffabbe688332d4f5bd2b21c1e11bd75
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16256 bytes
SHA-256: 059c2a8e30ee6beb8f86a05b44f7e88606e66f8f5c18c6a99908aeda3d089c2d
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1