Malicious PDF — malware analysis report

Static analysis result for SHA-256 3923003dfea2a409…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 08:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7a06e6f911668bd7a06b202bfe62cfc SHA-1: daab178b7f7663f52a0c81daca80d5ce6b81ec66 SHA-256: 3923003dfea2a4097e43349a38dcb5b9a4f2509ef5505c87842af3f63b56de5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302efa01122---79335693567.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbe8bbe81---fojarup.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b98037ecfd3527fc7f05a8c90d3b245c/dolenuwaluzipogexado.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/26612910020.pdfIn PDF document text
    • http://dejede.com/userfiles/file/33478979696.pdfIn PDF document text
    • http://glttek.com/userfiles/file/nesejelibewabinaf.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/br26g5fpu030utcc8da02ke6b6/36236448327.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/wuvidadalatudexapotijeb.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/lixejuvekok.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lewabavekexisolog.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72841296454.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/92f1971aba09e384a7d4161a3f961e32/23819737039.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a117cbcc732fac1c7eefe57b77f471e0/84506454588.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b99032b8bc9---20771014881.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210805_053643.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/rizelomazusutiwagibege.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/biloranivunanaliri.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/99815252116.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8cc9a852---papoxatawalazipu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/4167025096.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/73397838247.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/93144245492.pdfIn PDF document text
    • http://anm-av.de/uploads/files/warefunir.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/vegijalenexizoxivofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=moody+cow+meditates+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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 10724 bytes
SHA-256: eb01184e40897e1f5b884a208c7def10ff4c2f65e7f5bb47f7ee4f08dc9a917c
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 18336 bytes
SHA-256: e9c1b24c81602b5d214497cecf8384dcc1be8e54f044315269313a1e6239aeac

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