Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d4e189c6ff43ca…

MALICIOUS

PDF

78.7 KB Created: 2021-07-01 23:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afee408d647b189570db2c2bc4565b07 SHA-1: 15efad332f6d0b43f79c24b043041986c5af9de0 SHA-256: 44d4e189c6ff43ca94b54db0ac8c429f2cc246ede2f62354715d06d0f1c5e8de
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute further malicious content. The primary purpose appears to be luring users to download additional malicious PDFs through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3998f24ca2---vimekow.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b0841bb8---funobolo.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a08a9e89---8783645782.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/dukivunuzofigaje.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3bf776748f1a89f01c5a598ce875bc58/32195195609.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/faienhuusa7ur308hf0l4ak6n6/werujinefadejemomapu.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2852da0963af8a53591f18d0a5d136b/24900414662.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/57f882bf88de90bf62ffc618ed415f74/zimunanagopogefoga.pdf
    • http://absolutelyneon.com/userfiles/file/nupasidaworewepoponewe.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/546777c27ce45c3d3e65cb01d98dce69/4767241012.pdf
    • http://scantech3d.com/files/85302365239.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/sptatsmrocvnc2scov4uqe3165/godirosizanoligipalosona.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb94811c---zixujovo.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/39698262049.pdf
    • http://abpaluso.com/upload/file/78595436957.pdf
    • http://abwbaltimore.com/uploads/files/48868893162.pdf
    • http://anvlaw.com/userfiles/file/wibuzojiganuguzirubub.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fccd6796520f702b4af7ca5e9e68e234/fivelivegalotezis.pdf
    • http://piqiso.ru/userfiles/file/novezuxedaxipotimujo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608402d6e03da---74467345163.pdf
    • http://griswoldremgmt.com/uploads/files/wijujeser.pdf
    • http://cw-cut.com/uploads/file/78399246231.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a0fab0c1---84409792917.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1946d7d507eebd7899bd12f41ccf69a3/58553996829.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c32900f8---75476438473.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=andy%27s+lawn+mower+shop
    • 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_off0000d43e.bin
e295c223b93b2874050e1cdfa441ed4c147213cf7309d662f68cf2db413e0fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16072 bytes
font_01_sfnt_off0000fd58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 16792 bytes
font_02_sfnt_off0001156f.bin
b8e6411065e6a841cae19bf6d412c8c25260755cfc0062536101e8e3966455d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 10680 bytes