Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0a87441cf7f593…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 08:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e1ad2a87e1eb6571625be72dc9ac18b SHA-1: 6227febb0807538dabb9b832646eb5f1dc398b86 SHA-256: 0a0a87441cf7f59381d370521bfdf328f54f9ddab6e5b5a50100ef2a3b38618b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=hipotalamus+hipofisis+pdf PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742224ffb9---bitolisusozef.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/dafojatadikagopobawe.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/66335074304.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/rakukezedagom.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/143f2d997209732d03c793a0e43b0731/94179555848.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b4e94cc94c1bdac3bdb7ae4db5af2309/xibenutiwus.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ie7lopnioq2thad89m0dfvhg91/fokaj.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/47497061055.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/97513516372.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/78791723287.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/44821560905.pdfIn PDF document text
    • https://kawanmto.net/contents//files/dafudi.pdfIn PDF document text
    • https://soechi.id/userfiles/file/88975891183.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/68644268670.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/milaxe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3cmg96boe9rc2sakegbig814bs/7334705446.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ummikmgsl38v066f6mo8dd7u05/23730489039.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/97210325868.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defd73c47d1---zavifirewe.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6a106e3e8b1ba015f1c59f229639bbd5/wogilexax.pdfIn PDF document text
    • http://vuason.vn/upload/files/pilizizejo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/61497440807.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/80821392444.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/47053375546.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 10516 bytes
SHA-256: 0a8dea549d3192cd3e94a8350dcd77008862537469e6237b94e6221e3b0c94e0
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 20340 bytes
SHA-256: b0673bba6fa69f51c3217ea6d607f8106f6a8947c84a59b083d1be1073cfa326

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