Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f7f52d7c8b4b3b…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 06:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92d2912c30979ff491fafe0bc7f7f8a8 SHA-1: a8df8feff23fabd8fd5340a2e1134119144946d0 SHA-256: d3f7f52d7c8b4b3bc6fb59cf98ce9f5bc6c083fc48d9d6950bc34b28931a0348
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based design with a click-outward action, typical for redirecting users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to various domains, some of which appear to be compromised WordPress uploads, suggesting an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kartelabasligi.com/images_upload/files/4424510546.pdf In PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47984284740.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/58810459398.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/bakowakiviwibazifamikefip.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/26657317950.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/98625768846.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16152672d475c2---malozerawoga.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/mewafexosumu.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/50144158558.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/zuroke.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/17906631449.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/nilasesimejototarokijuv.pdfIn PDF document text
    • http://orderkai.com/uploads/files/16242682640.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/afe0760dea139d422d41b92982edf212/doxutuwomewide.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/vomewububagesazu.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fajirapurex.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/76126782735.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sefefigebovidosajenirur.pdfIn PDF document text
    • http://fluorescent-training.com/file/13593687101.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/nevubakezi.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/zugizukifagafusuvokadal.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/90358619637.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bf83dade---bozizegofido.pdfIn PDF document text
    • http://dentherapia.hu/files/file/jorikuzologijuwelopijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=flash+games+ipadPDF 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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 14272 bytes
SHA-256: ab5ff5c7f5ad9d52a6b6ee5940f17b2512dfba4e3217a038e9e9b7ea09d5d126
font_01_sfnt_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10392 bytes
SHA-256: 71cadeef631a18f43bb9fa0b6be7cf1d8fa9c97f05a86562ccd9d8204530e02e

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