Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f10b1997adf04e…

MALICIOUS

PDF

109.2 KB Created: 2021-06-29 04:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e0e8528be42b4dd051f583066070043b SHA-1: aca5f0603d2d32b56a126730f18c45b99d6ff9c8 SHA-256: 33f10b1997adf04edcbe73be9edf21a8e24ef3c616dd8b72f8f21aa08d9f89ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789f8524cf---65083879382.pdf In PDF document text
    • http://scamps.biz/userfiles/file/28417855743.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lideponirogalowoxaw.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1227e31822---6282715185.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/6669650202.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926e5e20e53---7413151256.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8l66dqj4f4r1tnqrug7kvmemrp/sefuvexobamatizomi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7b158bf2---midekuzokumufej.pdfIn PDF document text
    • http://hasyo.net/files/file/2858868738.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9f97079---sumegad.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/kodawabimof.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081943b8d4cf---27255044476.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094d795536b0---85787444572.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/58397123270.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c31f74b---79720513694.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05145e5443---jogelixakafuniwumerom.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0e36b5f9---xafufipezepojo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3flluhsemqrqkguiqmqbdoui2h/9029226776.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/bafajepomexepazelus.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s73ikcahkpe5tr88ggg2e2uftj/17729800029.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/muximepulono.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/pujewukidububa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c27d2b989e0188efb0e72fb899f38c21/43297225749.pdfIn PDF document text
    • https://advik.net/userfiles/file/vobutiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=caveat+definition+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001265e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1265E 19896 bytes
SHA-256: 3ae0654ee395922f978848d43e25772ea77984e84e38573ed131814fb642942f
font_00_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 10420 bytes
SHA-256: 4a2eccc19120c0159e317cf502cac134292b60161477a2c431185bdcb6a52c64
font_01_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 3936 bytes
SHA-256: 70496605b0c1443e997793e79b3c7149829b9e1c836606851717d5670d08f4dc
font_03_sfnt_off00014867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16079 29204 bytes
SHA-256: 8f742ca4fc4026d273658acbad49cb9dab4e8018ae3e9b84448421eaebdbc630

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