Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bcaeea8f220d37…

MALICIOUS

PDF

89.6 KB Created: 2021-07-06 19:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fad9a517357b3ed18824b8002cd5452d SHA-1: 5aaa834f521ab9f6dad4c42c6a5c686f68a70b0b SHA-256: d6bcaeea8f220d3790fd34dcf96b4a015471d6b07e6bb8871f8b5f33f7b8b344
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/60079b3132846c10b20abfccc31c5ae4/42755841153.pdf
    • http://asiavent.com/UserFiles/file///26904943785.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3c5b405f---bewepekajozawesetuj.pdf
    • http://popnmusic.fr/userfiles/file/9390346394.pdf
    • https://contactfm.be/userfiles/files/judabosirofilasel.pdf
    • http://www.pranabkumar.com/fckimages/file/xuvasuxegomuke.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1021b13d8---rovapepavubizokewevis.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d8d3b9a08d6f77032c57c851c59d5fe8/suberoneravujufup.pdf
    • http://studioarchperissinotto.eu/userfiles/files/liwexusapivabakef.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d076d0a4ff307610a3d3dd6a338df24b/8306192016.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/pidudatejene.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/wibamibeguvo.pdf
    • https://eslms.com/userfiles/file/8339411052.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o48hf0rmra99vq2av2q0dg92t0/86910932133.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afc371d32---tixajubulozezudor.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqua5rr5lv3fpi74j9ub776m21/93624639306.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc673ea58b0---95501459752.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff722b322---33241930552.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16087615ea0485---zutorujulapabetazugoda.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9039ff5dc145d1799e9dd60180d7abd6/80742280076.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0464aae849---54655760531.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/41d403f8b91474552a5704a7bbe4a338/bizanunewa.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/rewox.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dba1295a---joximuse.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845251d945c---sotogutijixijez.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/18a2a570064034c7b0c4382529a7f1c5/43268887988.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+endorse+a+check+to+someone
    • 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_off0000fb35.bin
90abc62295ab06a93305f58b7f2fa8af0a66fde236f570aa4a95eb31b588df08
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 17524 bytes
font_01_sfnt_off0001287e.bin
cfa1a3b1da42c705368b5683e7c2fd4b332127bbf74c8032de248612983b3340
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 10668 bytes
font_02_sfnt_off000140ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CE 16792 bytes