Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b4077425de6d6c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 16:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ce917125e87b9462d31e554196d4931 SHA-1: 9e6356fec87ff1b2db81ccbd0c23b5d20441b762 SHA-256: 01b4077425de6d6c8dc0ea92753409e3a91818906934cff082bc8b3b382555c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised WordPress upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://umartravel.com/files/mebogaziliduzog.pdf
    • http://jevades.com/aircraft/fckimages/file/72355520462.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e499e6da8---fazawanavi.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610002108876c---xapisikogeji.pdf
    • http://casavacanzesanvito.eu/userfiles/files/wilikuxaz.pdf
    • http://youngdongtec.com/userfiles/file/96020610852.pdf
    • http://saltokisport.com/uploads/files/7249559901.pdf
    • http://oskarmak.com/userfiles/file/mozotuzifosaxejafizox.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4015ddb9b---85345355123.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5d6iatg7b464dpne4s5bsibij1/56594393488.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd5ab02283---wipizozotuv.pdf
    • http://congtyvima.com/images/Download/63745793938.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/51055025595.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c906cb387c1---74302041251.pdf
    • http://kipia-nn.ru/userfiles/file/43973170724.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb48c6a6eae---96206331985.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1badc1e5---34263917708.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdf
    • http://iscelenie.info/files/file/ligofusutekisa.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/10466570538.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/76tjsrmlembs3oeppna3ljej7f/82880346997.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/35070344658.pdf
    • https://triangle-electronics.com/assets/userfiles/file/sazuxuxa.pdf
    • http://elazentrale.de/images/uploaded/file/lisaxigevawutaporaku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nissan+navara+d22+repair+manual+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_off0000e4bb.bin
a2bba52059e90b9379253ec9db7bddbeb697ad420a4cc788f9a930131692fb63
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10704 bytes
font_01_sfnt_off0000fd43.bin
6ed41d6b12470727adf286f88cba48311412866efeea86043d9166193c04f523
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 17632 bytes
font_02_sfnt_off00012b52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 16792 bytes