Malicious PDF — malware analysis report

Static analysis result for SHA-256 737abc45c28ccc3a…

MALICIOUS

PDF

102.8 KB Created: 2021-07-07 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1437b763742e232aecb1f756bbe9348c SHA-1: 1b1f6b384c39f8924eac9ebd260a3973414ad9ba SHA-256: 737abc45c28ccc3aa1ef81241d959432d54d93c0fbe48a79f2fd6502994dc3fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a7b942ab---23799605512.pdf In PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/97530051726.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g3dm0eoe3gdlp2780io1kcop3g/71357185825.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/lulokorariweduwizugusodi.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/pozew.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p9ls05165top131rrsf1lvj11m/32147218880.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7oon4k6cdkl6oeqjtavfmhlsdo/26121214537.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lekimaganefimatojewapi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5974a80afc---48601367035.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/juzipodopavag.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/453c3f8719ad5c088f01fe5457aa8bda/8246554994.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d92ca024---wivoxewagurolukaxud.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607383204402c---25055576340.pdfIn PDF document text
    • http://aps-mes.com/files/file/26337220075.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/163021219.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d3a8dcb8---letezisugijawi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/425rtal659no3h50iqhoei0t0e/wazagamirexiv.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd556e98086---sojemuzewiweju.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f5f14a5db63f05cac9df8bfe2aec736b/141024954.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/20831943967.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3p0f7a4gc7mlhg7afdq97s0o3m/91623011029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+say+hello+in+mandarin+chinesePDF 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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 19656 bytes
SHA-256: 43a150e12a5ee039b4dc366874ad1165278a54b8f872f0ac19693cfd3104f259
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 10828 bytes
SHA-256: 1d81ff6a4de69349f1d5c1e788429093290fbe5e972629e85ca65b2bc055f44a
font_03_sfnt_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 19412 bytes
SHA-256: 9545d6905c1f1ef91a72bcc51e91f69420ffdf4a9918083ff3733b272dde24f9

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