Malicious PDF — malware analysis report

Static analysis result for SHA-256 670ee8ef9ff1c343…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 10:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 75ac826fc7846667b0f16227d1833408 SHA-1: f5b94dbdfc18f6f8f46e1b3a651d387016e938ab SHA-256: 670ee8ef9ff1c3436e95402dea54da7751254e5114eb9cb3e00228f1d29c99b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only interface and clickable action triggers. It contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish for credentials. No scripts were extracted, but the PDF structure itself is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 70 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://darstin.com/userfiles/files/65093274794.pdf In PDF document text
    • http://plafondchauffant.fr/img/user/file/48236210960.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1632322985.pdfIn PDF document text
    • https://insp.biz/img/file/nomigokab.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/62724974027.pdfIn PDF document text
    • http://metapolar.hu/tmp/kepasok.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/61832429171.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a4668676---57611940839.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/42555268260.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/jakawikutov.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/87039204481.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/8535262854.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tafunililizabekosipe.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/10780402844.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57391491969.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/buluvipapijez.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a5278c92c334ea828f3d60826d2d1a5a/levafavuzevizodigug.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/gerawaridojiwuwifalab.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210916181330.pdfIn PDF document text
    • http://esipro.be/userfiles/file/nugonamasa.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zavobavepidivesuz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3ed4fc32---7980528252.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/fupoxabadotebusagag.pdfIn PDF document text
    • http://theblare.com/image/upload/file/keramusi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/voselirabizajezegitov.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9a883d5ea95f1d8bf31e8923746a2296/79836213410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+contemporary+monologues+for+femalesPDF 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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 11000 bytes
SHA-256: fee9b3ef613bb5c2360d640f4e16cc432bcb4ea98a2277616c10d4a15a8519da
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 14068 bytes
SHA-256: 4bd2a7dd4d0bb8cff37c771313ced28b8eeabcc6c9f7ad4bb206767bb452b20b

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