Malicious PDF — malware analysis report

Static analysis result for SHA-256 645cf4dbe6505920…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 12:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ab2d247a3d34c3b7d02ddb03cd9801d SHA-1: 1e9a937a2470df33115963450b2116325738be66 SHA-256: 645cf4dbe6505920260aa282e805be5642fa550615c259553d6bd24e8c840aed
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish users. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tekizolasyon.com/ckfinder/userfiles/files/12944829969.pdf In PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/23905106656.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/xutezunamamesenuzajuritib.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/79993613181.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bapeminudomukazig.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/duxagagunekewowek.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/24193585612.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/povozirokuxokaka.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138eec92aaa6---fofavukepakeg.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/jinivagolowakod.pdfIn PDF document text
    • http://kccmaul.com/files/files/5276365776.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/35eknqqoddbufiudp53oeo137r/2209707655.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52096913185.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70f887fbd---tejijajusipulamoze.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/niteguxuwubesososagovegif.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fc53dbbd2465a6461ac4745a7095ecda/93856234097.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/76e97666386512913a4f98e95ba82050/74570529887.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/9796137200.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/29267246867.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • http://okvin.org/userfiles/file/95246621069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=super+vpn+premium+apk+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB484 10704 bytes
SHA-256: fbd95d7866f6132294cf6c01749f936d889452bce28a941f67407ee661c52fe9
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16568 bytes
SHA-256: 65ec70f30ad38ff6ddba3bc35c13586293676311a76bafb25e63165960096a50
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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