Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f5e63ef494a27d…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 247707315e297f0a0ddd6074132436a0 SHA-1: c2650697f49663ee8823980d352022d279c0617b SHA-256: 29f5e63ef494a27dbe7273f839e9ebf4d36b44dde17a9cb1907b5770b43602da
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=spacing+out+meaning
    • https://slide-bearing.com/d/files/7055012715.pdf
    • https://paron-rebondir.com/uploads/files/jirojebeganitefebevil.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d84e90e10---nijezuxejenij.pdf
    • https://xo-sound.ru/userfiles/file/17034385570.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/8f6ee2917d063ac33439156f6a35c465/xunumizezavurezit.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ebe7a386---13410504465.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/an2d3i00f2bjft0i4hevt2otgg/kesopo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0a16449d556c3b9d8fa9e2a4423d70b8/siwukurenogesodabegu.pdf
    • http://akcjonariusz.com/UserFiles/file/mapeniverujixofejorakof.pdf
    • http://ranaghatpchsschool.org/userfiles/file/wogiraxatolo.pdf
    • https://lasanisports.com/files/18399991620.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/67653736800322d7321ae34d5db42e82/16731153342.pdf
    • https://alperbehang.nl/userfiles/file/pinesagel.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b9a5a61f5b6f178126653d1388bd78b/dudenonesere.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160743bc41c3f6---1075501689.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f85e34cd2ba2078dca1f59757a12cb2f/jotisuralizejozadefil.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9vbpkn4vdn7ias19sig1kpj4ns/wirobuzenotiwidotonos.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8babb4219---51116534948.pdf
    • http://koryosushi.com/uploads/files/basid.pdf
    • http://skrabl.pl/www/rpbd/fck/file/23671919595.pdf
    • http://www.anclupnapoli.it/userfiles/file/17207986237.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e755b8be34d999480f2461d095df7301/17377799208.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e8c00f966245477b14dd277daca2240a/86749358237.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_off0000e373.bin
4381fe877081b60ac15a80332f1775b44dc3c3deca27f7a779b5741d10a3c0df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 10580 bytes
font_01_sfnt_off0000fba5.bin
d66f01ae25f0cceb252036082085c07351d486ca8381b62b595b30426870cf64
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 17628 bytes
font_02_sfnt_off000128b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes