Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf51ff1f59fd4870…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 14:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 542f146184eb446dab66525c5412d0e2 SHA-1: b56332e268b5ae07075053caaed313be102705a6 SHA-256: cf51ff1f59fd4870e637f759fcdb78f9f9b5e8b79813f423a13b002430573c07
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself appears to be a lure, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab099fd984d---gagazetevopuruworipowulok.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcb95d541---kukasepawuvabupebof.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/22339390011.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715b0a95880---kevisonosaveli.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/murekezifumewubolo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a92001b0d58---tepozisikini.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/49220949682.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/wogusiwifuzogi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/jetabotuvimugoviregopotum.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/01ae0ee2fcc6c59395ef2c786edda017/25658092577.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db1cb6ea217---walanenidimaboxiweli.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021081182742_1015920380.pdfIn PDF document text
    • http://skrn.cz/pic/file/delufime.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/35981756507.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/16575261510.pdfIn PDF document text
    • https://ijpdua.com/contents//files/rizefuzasamamu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b485cb884---fovafowetifejage.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de7555f96---73583278741.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hq110ikv030tbmuvajfoqmn6vd/limituv.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b431794e---28600139005.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qi7lfkqt4su1pc5irld64tl8tq/64551784753.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/32776378448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=welder+resume+sample+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1d4d26337835de98d7f0357316c2aa36/jubaxamofafus.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 16240 bytes
SHA-256: 678ea956ef62dc7222f818ad080a0b1d8869132acae37acf526abe94849d4bd7
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10336 bytes
SHA-256: 16e3132c8fab075c716ed398e20e10e77e05827cf647933bacb43f0a70eee6fd

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