Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1caf95208802ae…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 13:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6487bd63ab9819039ece16fd67d3e91 SHA-1: f7663c198493d7daea3b6d72f6cb29b38fadd227 SHA-256: cf1caf95208802ae12ab424f9fa4d4c5d9313f2a41c65947ff3a7a444dedfb07
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://clubslotalmatriche.com/calcas/file/dalosesu.pdf In PDF document text
    • https://hchoanglong.vn/userfiles/file/57032957284.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/domovofu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57cbf32c4d---50536811100.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/74545574779.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/potopirosak.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/94011375495.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8cab3424c---32913562485.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918fc9152b---6843695208.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/68498176436.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/wilujufisokobetoz.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/23131739588.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/61902942905.pdfIn PDF document text
    • http://df-2.de/images/daten/file/98852526783.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a009b24ed---55686060000.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/wulozanozemaduvi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/39611431757.pdfIn PDF document text
    • https://deepex.hu/hirek/files/68338859084.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1c115624a979dee5848f13cd168042f8/fogelatonesoligove.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0bc12fbe---51172787711.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503015113568642.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/201845011114.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/savuguxijaxebojubez.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/64705580889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=design+and+transition+itil+4PDF 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 10500 bytes
SHA-256: f2b181ca25cbb80c6732f1bffefe28563b6fd4fe8fcda003a3c6a7aaaec7f253
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 18400 bytes
SHA-256: 38133da2e738ea7f74788e9a6ae1dec3f9ea2be596c180b815288c0e0c6272e1

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