Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac619b34689388d5…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8717c6c8cfb9cf13930b219e4fc8ae62 SHA-1: 6f2f79f34ad9bf276023cdee67f045fb1527479e SHA-256: ac619b34689388d5d70d45a3409e9c4da75fbaac1750954b50ff9f0013651d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jeanmarcrobion.fr/userfiles/file/kujadedes.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/54316286630.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/mupekonogupej.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/soxewunolavikovu.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/77716519166.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/34091292619.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/tiduduribodades.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/67843530223.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fb69e30f329e65f0c4f9792c17883d04/70764408350.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lenir.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/wejonasutasasabe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n2hsm9ibs75chssq9q7oi6e0fi/48187198623.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/8904760686.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0033037f7---52709903080.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/fowusizidiweze.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/33071517889.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bitunasubefabufigowu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/57379661645.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2607e0a4d---32094278295.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/76067883003.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/51711194252.pdfIn PDF document text
    • https://trexanh.net/upload/files/75846655165.pdfIn PDF document text
    • http://njxinbell.com/upload/files/38645032494.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312284922895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+moral+landscape+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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 15672 bytes
SHA-256: 6e73af74db5ed5773e8bc62954518cd38b04e1cbcdf1814b70ba48958d9a7428
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 10660 bytes
SHA-256: 0862a5c53b353500680ba5a0fe245ea6895686e753415176777786ba165dd5de
font_02_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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