Malicious PDF — malware analysis report

Static analysis result for SHA-256 8394a7b040122aff…

MALICIOUS

PDF

96.5 KB Created: 2021-08-11 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cf0ca503e54ff466c19fce7a14d0387 SHA-1: 022d182affc6b148ed24eb605911c7df52c33816 SHA-256: 8394a7b040122affdeb50d7a8367fa5d70ac7fd0e1119bf4286ed7217196ba96
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable hosting. The primary goal appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://steklo-shik.ru/userfiles/file/39322984085.pdf In PDF document text
    • http://karinameal.ru/imgdish/files/tutezalimuw.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/15638985648.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/volal.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/128cb51b3c63c88d410fe56f8e010d15/13436062730.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/74143bfd7ebb802b687feb48610750ae/kujavuxewijo.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/ranafozeg.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06c49ad14---gogezot.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be621c1cdae---71909995459.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87465142837.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7qq5afatl8r1n27pofd0nd9qd5/gunuvuf.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/90850318418.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1fqepad867qcv55ur8tqheege6/moxugopukinotuza.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/fegitiwaraxafumuva.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/33801424400.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608360ac23bc3---loreritezifutoweme.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5b07e3918b49bc7180c32bc7b5e64003/82075260627.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/26b40ec4173d8700d3f4345571666291/27783203425.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/714ab6aa2eacc82529ad458ac667c5c1/45192135364.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/datuxakixazaderu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dakezim.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/55052672243.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5d991679---wodusabukiraxule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pathfinder+life+sciences+books+pdfPDF 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_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 10948 bytes
SHA-256: d427e909e9f518cb366dc7c8aab7eeb61c571b4d92c286d808f79b14fe62cb77
font_01_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 17180 bytes
SHA-256: 0219ce5d9bb1a4ea2dee3c3347c19fb623be4504d9c519e45250721b1cbf9de2
font_02_sfnt_off00015b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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