Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22f2fd9a53c6002…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca0857d9fb1c8be18f20bbbd87544fe9 SHA-1: 558991f536ddaf5f04737c29041e1525ec87096c SHA-256: c22f2fd9a53c600245a8dbaff5f8a94b9749d971e832d5d63633f4f502969c9e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external URIs and link farm heuristics, indicating a strong likelihood of redirecting users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fjibehnbq069o6q0561ncg112/tebodujebiledipe.pdf In PDF document text
    • https://ikansambel.com/contents//files/temopanibonanina.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/sasadali.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a845f0f61---2672314340.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/9259366583.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg5uj47ln2aq4gokodbtu94k34/xufozive.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768c22ac4d4---baguxotuwipas.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e85f0aa95---58783614925.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dmjli2ts3sjljvbt5rbol7qcs2/40108970443.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/03e92a6ff52cd55d09306b931884af74/debenaxomelokaranijer.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/569015638.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/80612592543.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/lafawedogikezij.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/413cbb0d85130aa4f7e1039b3abab580/81358346017.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/10193319593.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a18d630c---51815221169.pdfIn PDF document text
    • https://onecre.com/images/content/files/jagavilomago.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2fb4694e6---xonewoxejupetuku.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/defagujuzurijuvibejifeb.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/73483506528.pdfIn PDF document text
    • http://promador.pl/userfiles/file/gorobiseg.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/riximojosixevib.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/73188372295.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/metoxejizitajewekibut.pdfIn PDF document text
    • http://servmed.net/userfiles/file/punimexov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bishops+storehouse+order+form+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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10604 bytes
SHA-256: 3ab817cd0e634895656ff7b1a6a377d428771e7384d0064b18495344e8b4b4ee
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 18440 bytes
SHA-256: e784798b85639382283d0981efbd3917edd2419c4f3a18de954ed9c093abc0c7
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1