Malicious PDF — malware analysis report

Static analysis result for SHA-256 30826f67c52a6766…

MALICIOUS

PDF

104.8 KB Created: 2021-07-01 00:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b3a4eba596649a718149cee8087adde SHA-1: f10c3dac4581207486e2a30e7109fa874e12fcf4 SHA-256: 30826f67c52a6766ddccab80ab3f55aee34f6f4855dc22330f66ab66c28397fe
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://remobudostol.pl/pliki/janidu.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e79136804952b4b68ee65cd6b6b38e6b/78298694428.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/digadovaxejaf.pdf
    • https://discovercefalu.com/_data/images/file/13430278910.pdf
    • http://caopump.com/admin/userfiles/file/25506240300.pdf
    • https://o-dance.com/upload/files/30573966921.pdf
    • http://meadescafe.com/userfiles/file/puvamukepabo.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g5tcof667jo6mq3aaki489u2d4/79761287188.pdf
    • http://all-pass.com/folder/editor/file/kitokigunodoruju.pdf
    • http://anatolianlgs.com/userfiles/file/79710282844.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccea68a932---72739643933.pdf
    • https://amrapalispot.com/userfiles/file/wexelepejukune.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cad911cd9---24340411236.pdf
    • http://mamnonlittlesun.com/upload/files/lirapudozekiragimumizun.pdf
    • http://absolutelyneon.com/userfiles/file/1939746359.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f5d04917---67764222402.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a971d972e40---27894414185.pdf
    • https://aradovan.com/userfiles/file/50080013160.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf22c95db---kafukatagabiwokegudawiro.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e77f3137---leripuzikoxunuwoj.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c8a059d66afd767f54de54f7ea206578/tujolarelunalagasokotaj.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae587eae3---joworobu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f2d37abdf5eed99fd05a7ac872bb0348/munewamunuki.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/klev72epk1rmbep9j5l4pbl76a/mewudobuvidiladuxizuf.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b167aac5ab6---geduselusek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=an+igneous+rock+with+large+crystals
    • 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_off000133eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 16792 bytes
font_01_sfnt_off00014c02.bin
7bbf49946e9819045f2e903f7c7a6f8ebd071fe1cdcc240870fdb8f455ab8ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C02 10880 bytes
font_02_sfnt_off0001653f.bin
2f7f70b7d25f09c351cbc810e33a806d689d5b7aad9a9bf66ead943e9a07d156
pdf-font-stream PDF embedded font (sfnt) at offset 0x1653F 17928 bytes