Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7ba650be5bacb3…

MALICIOUS

PDF

68.0 KB Created: 2021-09-03 23:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7564648581d376b0dbe7cb73d5526e0f SHA-1: 225b3790f70d09f9c515aaffad9d49e90395a2d4 SHA-256: 9d7ba650be5bacb39c63f150fe66cebbf3b3a78316c397fa6bddc5493f24d3e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely intended to trick users into clicking embedded links. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to hide clickable actions. Multiple heuristics point to link farms hosted on potentially compromised or disposable domains, suggesting a distribution mechanism for malicious content. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amdind.com/userfiles/file/marajuvebadudotuvodaf.pdf In PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/741152111.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/71885162033.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/278664824451625462043.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/selomulezugi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e0e94a73ee9915c61a59c5a336364f0f/98460928081.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/72339389587.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520014245470931.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/fajopebagixuv.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c7f8377603e8fe821ae08fce3b344738/74437584927.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/11517984102.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/38789978239.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dudokoxugekuvabowefag.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vimipetumurodox.pdfIn PDF document text
    • http://asfalon.com/__files/file/gadenifi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f018f36167b---gawurowobefewezovijazel.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/de993be8edf7c2b1a3e69b27f273a9d2/97900710073.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/10757634456.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/satibudodinopaki.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/850ecf1c6882eeb0d93c0ac5ae944244/kelugoduvonepu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/37905187890.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/30874612284.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e782426f69---zazolasugedubavez.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/lereselesabilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hdfc+mutual+fund+common+application+form+pdf+downloadPDF 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_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 13692 bytes
SHA-256: b2c7c1c72bd89c1686affc2aa925b1173e412028756ffa365da3e8f7df75f93d
font_01_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 10656 bytes
SHA-256: 0315525aa216fe9762647d6e37fac50b3b91f710699e33177a646a6d564a889c
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1