Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce385e3ac6932ee…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 01:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fefccbd1e9ba2f05c6a6215f0265fbe1 SHA-1: 0d1d4d05375dcf00da20185f69bcf43c215bcc64 SHA-256: fce385e3ac6932ee2813f317ff316aa88b85e7b0d04dbca34166f80070c54009
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/25ojjbuld02nlib74a40rteo0b/69595921212.pdf In PDF document text
    • http://pass38.com/images/contentimages/files/5324041997.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/witapagekasew.pdfIn PDF document text
    • https://mattress-leader.com/media/95545854200.pdfIn PDF document text
    • http://polkovnik.su/upload/file/mekufepo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/xofixodefamesitoga.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/27065932611.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/58067503556.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/822c75bfff125c736a22eeb4d5c211c6/gepalupolu.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lumagilasewobitopegiv.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/91758267676.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/darutajidifupasadijidoval.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/genafor.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/58230971343.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/pagomaf.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d20b71169c99959621343631a957ce7e/jevedomutadulazi.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pegijez.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/luwatenonosit.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vinusatixe.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/dusupakatijabowukidowi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9q228d64l6ds3ofi6em398m21/64265659096.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090120321817.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/54473367686.pdfIn PDF document text
    • http://vucert.vn/uploads/files/xajizogogetemuropogasowat.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mipuvelobijakukoz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/39335262875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=record+video+on+androidPDF 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_off0000b5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 10164 bytes
SHA-256: f06d2de5d44d5cf09ab9e649d66724b4c640c7f3d5a97d8d3133be589b447804
font_01_sfnt_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 16840 bytes
SHA-256: 687d5501df401b74f7724d8346255045799c55f478d6374d1736e41ba6df24e9
font_02_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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