Malicious PDF — malware analysis report

Static analysis result for SHA-256 575d97e1543e2252…

MALICIOUS

PDF

99.0 KB Created: 2021-06-25 16:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9906150873816ab2b0b8b2be1e07e2b SHA-1: 36751516b2a6487f45305e46bc14847f87d2d8f9 SHA-256: 575d97e1543e2252a67ec633e10921ef4ed2bbf7968db5de3cb49d1a647ddb0c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, acting as a link farm. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1f9bd408---nozupa.pdf
    • http://littlepearlspublishing.in/data/eimages/file/bemevamarewunere.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5be069f12e8b42d4a4f3cdd55331f6fa/80978273486.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083b59278848---patufunadutov.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ugqg7n5evunaar4ekug6rnchsc/wegerubedi.pdf
    • http://goref.ru/files/file/tebewajigemojasogupez.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de906b5b0b---nebegemexosu.pdf
    • http://omonetach.pl/foto/ilustracje/file/17789021106.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080678d26162---nopovijiguf.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094037687b3a---wifitasuz.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8276a6d44---mexavarizavenimojusujuxu.pdf
    • https://amitadevnani.com/userfiles/file/vuzatapumofekav.pdf
    • https://aawyx.com/sites/default/imageuser/file/xakiwusuzasitavojezifuka.pdf
    • http://dancedynamicsla.com/clients/38740/File/mewebofubifovoxibo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca114913c8---silizubemowov.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1cbb6ed876a784127700c0571c8669cf/47042834479.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160903fb35b7e6---gukojoxitisi.pdf
    • http://www.aqsclimited.com/EditorImages/file/berifinuvedoxadomager.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chemical+oxygen+demand+lab+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001202e.bin
009006dd52e499e6adae43e3ef830566918fb2313c3ffc73ebc009ef3d4861a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 17536 bytes
font_01_sfnt_off00014e47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 16792 bytes
font_02_sfnt_off0001665e.bin
f72321a044efa0d655f826c5fe33e96a79ae40c7de1ee3a86b9d8a8fd0048038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1665E 10940 bytes

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