Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e93aa62ff3f1091…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 00:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 671650a888510f222a23979c110968d4 SHA-1: 8806549558b0a000cfec6ee249d99c253e13c293 SHA-256: 3e93aa62ff3f1091f2360670db75fee03ea32036352438921776ea1e3be8aa39
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to potentially compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b357c713993---xabalo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04da5950dd0e6f142b1f7c216b2b85bb/tebokewabizomiditar.pdf
    • http://tingchucontrol.com/Uploadfiles/files/pegisemukexatisibevawabe.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/26604695215.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/8630209324.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ed39a73d---mogarerexasirojivuwoseka.pdf
    • http://czdashan.cn/uploadfile/file/2021050121290073499.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b010d411ef5---dotipuvib.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a876cbd9---50338759368.pdf
    • https://ptkas.com/kingkong/userfiles/files/54924580620.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096468468144---nilegegulejekovewi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161291c84542c1---45899346634.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/96c81e7fc0afff842ee3fbba20fbf83c/detov.pdf
    • https://canevastoilestjean.com/upload/editor/file/pirolekoge.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eca265c2dc6d4892fdb865bcd639e45b/77860657688.pdf
    • http://drxzhang.com/userfiles/file/84347938069.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k0n9413ngeld14o2sbdvcgi52q/lezubitevoveto.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zumitomesugemivitogewiki.pdf
    • http://nature-revive.org/files/file/65205538275.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed5370c25---6973040882.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ceaf2d8---buborujimuvolokividu.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/gavorofinofeb.pdf
    • http://fteq.ru/files/file/navajafasiwegemixawat.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/33d8965ce6d616c850a0713eebcbbed0/89832246584.pdf
    • http://newtrichur.com/userfiles/file/gezozevunasofito.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c6ec38db63e04bffc1c8c14489178dd1/72332063775.pdf
    • https://sentinels.ro/userfiles/file/muxufodopuzasojasidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=guitar+arpeggio+exercises+beginners+pdf
    • 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_off0000ddad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 16792 bytes
font_01_sfnt_off0000f5c4.bin
58652ed5cf7f1484f7db823c10c24d2a771dbb356ba617f559b0e643df41419b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 11128 bytes
font_02_sfnt_off00010f7d.bin
139ab3381896e44c4ef8deb653706c649738af2ef2f59dbfacc4d7ddd1b6b081
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 17336 bytes