Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaf8012bd908001…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 05:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c726e88fcc10a1541dfdc92299b6b810 SHA-1: 6cb16773256ad3598cf1333688162cdfdfd1ceb7 SHA-256: faaf8012bd90800191ee9c37b5a1dba3d800ba1b1bec3d376e706d53d97ad3e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://teifsepahan.com/files/file/kivunuvojiladozep.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53af1f34---56008339037.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/dikupoj.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/25778235522.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/puzusaxememediki.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/708414181.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/27761940611.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130121e20bfe---43833443388.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/dixofadudofikafuba.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb0716959---45405741567.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/xusamologa.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/revit.pdfIn PDF document text
    • http://drironcat.com/images/file/tapakakezupinelinefuxu.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/81063454635.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/15409835431.pdfIn PDF document text
    • http://4rrecycle.com/files/file/mezuw.pdfIn PDF document text
    • https://coevent.ru/upload/files/rekumatubugasuxopiniv.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/eb01aa54b8d973ce2495f463d33ea4e5/32539191652.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/lefawizenaluselefejuvuba.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091313010473499.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/sonojiru.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141141604ab3---sodudeno.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/lopevopukototu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/biron.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/pejofugatotodiwolozujab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+about+us+guitar+chordsPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10636 bytes
SHA-256: 8375fd94df59d04b147f749f841f7ce393337b12c096138b45b0044160a8bae8
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16972 bytes
SHA-256: 41a3df3d9e8b1e825864eda94475be94df5259e1a48c30de9d8e8d466193e556
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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