Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f3996a14a8d6c…

MALICIOUS

PDF

85.5 KB Created: 2021-08-05 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca254e1a4c5b81fd6d8e1113b3ce4fed SHA-1: 9d4728873d753a6b298fecdff4e680744e84e6c3 SHA-256: 934f3996a14a8d6c6c581c001847867a34a5ed274454263a21f84c2ce802e220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were directly extracted, the nature of the link farm implies an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kinel-hunter.ru/upfiles/file/66172972588.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/lusagidipimuduwifapo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/41ba46f4c47af597e7cf60e9c98f90cc/92931340458.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/verupefavebidevofugiwojin.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ccbs32itp2ugntkb2maql0g6i4/60195790479.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/toboj.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3aadc4f8920cc7f8d793192ff66bd971/78285046006.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/203670980.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/30259987641.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ee738b0a814ca7c1aa5a5a7d49e822ab/74396809019.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626020941233908.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vobawonowegobu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160edd61d3c2b9---40486133802.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/vifofaxumuzojitofelof.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45410e2c78---bigasibifamuwimazaf.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4r5qddqk23l8b3iloo8onbg11u/12986112048.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/40576221703.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kimoneminoxer.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/33133062029.pdfIn PDF document text
    • https://alutat.com/data/file/suxejizet.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/forigamuwamasadumovozat.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/xudofusumosunugudolowiw.pdfIn PDF document text
    • http://kaies.cn/upfiles/2108050931557986212oe7sv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=1st+conditional+sentences+worksheetsPDF 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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 17612 bytes
SHA-256: a00e70e348dcd56b6dff9d8b562ec6cbc4879b51728186f27ef2d60a21bd02d4
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 10600 bytes
SHA-256: f186f6074ff6fb981a815a66035bf71f7e5b2ab631911c861b07420612e89933

Open this report in the interactive analyzer, or submit your own file for analysis.