Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cef01e95143672…

MALICIOUS

PDF

130.6 KB Created: 2021-07-08 08:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a67d0a5edd6d9ab4bc73b63c5c9a23cd SHA-1: 9cc12fc71621c180de3cdf107b0cdf0dc7e10062 SHA-256: b9cef01e95143672310a2be510026b7349ae846506a53f86d220ddad7e09afbb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves malicious content. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt at SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://dnepropress.net/files/file/fivopuxoviluj.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5e8eb6b8ec64d892e5feac532106ec35/28102199965.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecce99db7c---kiborogunujafasagob.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4c06f0735fa4cb5d5f64f4c433410e68/gewewekubowivebideked.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/ziselisowulijepexupa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eae3703ecb0ef5ca70a4d92e11e50a50/17788978922.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/tn4phdv25ad5aeivit41lgi02c/debupubinoxid.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f7b2b45f---nupovomuxifekiwamagida.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/niruz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5297229500---88969149853.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/87955997499.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-14/20210614091427639952.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3afc55j4blab38p7h8i3d06stj/pepujewi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/puzevivodedelu.pdfIn PDF document text
    • http://goref.ru/files/file/89111776671.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5q2l10k131jj72cmk5mc9gk6d/vefetibaraliferorof.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5p7l9ka9f6c5iv62k4qn9j6cbe/14662264838.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xowokegowejo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16087842a350fb---zeliv.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/77834218968.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a488e51b5318872799da3d495300bedd/wutudexefikat.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/257352f39f2ee5aacefd7bbab85fc3ee/89436569809.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b41c03ae1---guxeged.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ddg0alri69gb8khhp5g4s653es/zimuxosatawirabomebonow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=good+morning+kiss+images+for+himPDF 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_off00019a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B216 19056 bytes
SHA-256: 2b1d7e7a3fbfc9d5703fd860f5c787c3f04b2cf39aa2a2cc1d39fba8bb9c5e07
font_02_sfnt_off0001e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E45F 10788 bytes
SHA-256: 80f662a9da89bee93eb9ad857a802dcec5fde594a25d94ade3f03abb9d96d208