Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331591f43c519bc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 22:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6db7f1111d6b730a1a655b0f65fa8850 SHA-1: b06d9b35f82f105769797cbc33c5164c9f452557 SHA-256: 0331591f43c519bc8f4eab1a7ca6ee975f2f7fbd57e9da685691e77858c9018c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/42484837621.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccb86c53d---wakewotetatelamuvomaler.pdfIn PDF document text
    • https://service-panev.com/userfiles/xelubogixawovabanowuf.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/61424989017.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5a5c4f13---vosibovamobomatowugobopif.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nanewuwusajefevaje.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030747593589.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/1390770074.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/janaluxeza.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/gerilifibigirif.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/bibij.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/2191198722.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/3003698703.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/54938508134.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/13878335567.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/35875820527.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/16627685167.pdfIn PDF document text
    • http://allycatering.com/userfiles/50791149759.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/61659230587.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25114614302.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/69545476586.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/94527896026.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/60109308026.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/44027177312.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16073528044.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaed18c296---87145339140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=transfer+app+data+from+one+phone+to+anotherPDF 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 18472 bytes
SHA-256: c043d79e2a771244fe6127aee9b957fb4c162e85982f6ea82cbc6dcf44528a6b
font_01_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 10588 bytes
SHA-256: 9cd86d1aff37b750ff725ecc1a3c382eccaeb7001fee585806bed14242a3d817
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1