Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4573f8f1ac7dd4e…

MALICIOUS

PDF

75.8 KB Created: 2021-07-16 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c9568971792706e22841401ba2d49c2 SHA-1: 788ef4b939c5e8016788755b8ca669d0af1b726f SHA-256: f4573f8f1ac7dd4eeea0a21e3a1f4e09ce7682f0b965c2a321f64b03179e388b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ga55c63d13ca1skistvc7u7ac4/66294770177.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2c91385b---bopedosomane.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/juviz.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/diwikiwabalakexovejubixe.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea18ea17---dulowatobosagisip.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dvlplk6ps1opcg1lpuiv7p4kd6/lanuxesenizalew.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3650002f5---5441887012.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/5nc8njkgcjs82e507pri4tnr21/xoxejado.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a39475d8c09cb76834a035e44c2c30b6/68870738045.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/53575589025.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78f3bdf0ac---kovesuradojuwunekepixovi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9b13db87299ec1ce727f31920d75cacc/27629669394.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3725b920---sedaxizosonoronenalab.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/jaledubofesefowarulufume.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41446b3a7---pudisurup.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4bn28pnt7fjtuhf2htjil84hp5/niziberigexalirovalexeti.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5ade5604a2b3180f58d1639db5b55089/8863748687.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/poxexomemitenupop.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c57i38uq6ud0b23ejuu9il9bd3/7856633289.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5d1ff6fe209269dc8a109b59b5ba262d/56026765236.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/89634880424.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd33aa5f4---petukewugupibiromelanit.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/51737244318.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/19921249085.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/itl7pvio1ftlf5vrtd9fn9b3a4/8128098763.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/onav57b6129lf6p8lk9df3ippu/zadim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=find+all+second+partial+derivativesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10552 bytes
SHA-256: f868c666ee9e42621fa81bb8059aae8e85bbdec7224c3056d1069b88b9e23031
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 17316 bytes
SHA-256: 89be1cccd13d013da316f55ee16a00346a5ba9ca414f1ab56969ce028b87fd42