Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f1ad5006d5c0ee…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 22:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3321a3f287662c13a33923bdd3a1f01 SHA-1: 8ca18dc3cfa3d228cd0333756aceaf1b9594820e SHA-256: d1f1ad5006d5c0ee0f5219405f4648d089f700ff3a306db2c19adb22382423bd
196 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Several heuristics indicate it's part of a link farm hosted on compromised or disposable domains, with one link pointing directly to an IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 72 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fzsvybbs.at/userfiles/file/tufovukixalaxiwopa.pdf In PDF document text
    • http://185.33.116.145/~acus01/upload/files/78591851893.pdfPDF link annotation
    • http://nicenpos.com/userData/board/file/fefumowaxep.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/34318713778.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/vivetimigegamon.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zideborenilawoxofuwab.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615077db5a5ab---julizoroselifekoseji.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615080032b2bf---10735309248.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/pipexuwobixo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9594921394a02b946e4f02cbc2916e48/mapenibenefimi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bogobisuwiluzaka.pdfIn PDF document text
    • http://bptramptour.pl/files/file/demedisar.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/50619731953.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/16496895771.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161445aec24add---4115192800.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/74474836835.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/navutexuxelefojewini.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34f4b7d0e---63260945928.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/32902567052.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/51795512390.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/31804154925.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/18111271333.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/58568447749.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109260014336373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=instagram+profile+visit+checkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 2920 bytes
SHA-256: 83d32ff3f87038be413a36dddb67c70fa3404cfa7ce61fc3bb9468aa460604f2
font_01_sfnt_off0000bf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 11036 bytes
SHA-256: 8246b6e8dc88187829fee688a8a5d8d3f84d4d098b424f6343226875bf94b719
font_02_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 13856 bytes
SHA-256: 49ef45133adc6131b78ec2385e0b30a541cd531a3a5e7d5ff46a438b8c712af6