Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f5955b0a32c631…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 11:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af4396445e9a8daf1ac4c46f01d6c52 SHA-1: c80137774a925a2e8cc79eb44f39f629cedce4b9 SHA-256: b3f5955b0a32c631945cf4c512bbafe0c65758affacc79d5a9b8b9266e768815
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bestrecycledautoparts.net/images_i/file/68223185594.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0a3d9af5---24945414954.pdf
    • http://dreamwith.gni.kr/ckupload/files/58599936003.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3aa5bcbd3c3426899d997628a52705f3/gotutekexike.pdf
    • https://elemental-ia.com/userfiles/file/5391590291.pdf
    • http://faw-asia.com/image/upload/files/83189907550.pdf
    • http://yonseri.org/userfiles/files/gavazusakijoxanulisuta.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/1835064122.pdf
    • http://slesnick.net/userfiles/files/60480399954.pdf
    • http://pcccmiennam.com/media/ftp/file/dozadejarigonesakedoje.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0c3981a4b8bbddec106fa59269302a75/welapavofi.pdf
    • http://hbaoge.com/upload/files/refogawemebefipawuki.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097363b4b2---xitumituwotoxefi.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cvre2g54ekn1v6mo1qu734f5l1/mivolelonotesujurob.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0600b4f18---kobukaponev.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2687bc52---nawizopimixipilaje.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a01a5c4a8---kabelawofedawuk.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d89fb2b73c---sejifozorixalalume.pdf
    • http://soluzionebenessere.eu/userfiles/files/wilatikununadisotis.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c8d74299705dfde0fa62b7a7446d33b0/40737354206.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cee01e3d4---setalaxijixatumuj.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7de9f9b8b43f751d34ad90d5672b35fc/67400497053.pdf
    • https://total-sport.pl/img/upload/files/14742442294.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tabla+de+conversion+de+unidades+de+potencia+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_off0000ddd5.bin
4a80e7a4f20852b2ba3124ed54faf71b7fbc66c9fbaaac72c75b353d5fc045cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 20120 bytes
font_01_sfnt_off000110e0.bin
8254755567ea4526214275fdde1ec0ba42bbc507add1d233e9ed122f41a04814
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10880 bytes
font_02_sfnt_off000129f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 16792 bytes