Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282f3ca85281370…

MALICIOUS

PDF

79.6 KB Created: 2021-07-01 13:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407287cb5c838779e95165bae837074e SHA-1: 2abadc648b39109f2c7b3ecf78d40f5c0003ec64 SHA-256: a282f3ca85281370a20bad1822e2104009a245b29d08babb44d0b8918d0d1475
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or 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, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://learningkey.org/userfiles/binekufokesoja.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/7ca9d74af4d33027d0c70dd8abd7c0a6/89827088819.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/67442318346.pdf
    • http://auxerretv.com/content/public/file/vofivoliwatepo.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/53a83e28f56732d2c992876af86f75ea/jufagosesuwavasu.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f6cc875c0530abdfdf7d581c4bb4ad9d/removitigig.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b5msf3kslkb6rimdqaa9mkstih/leladinojejilen.pdf
    • http://sungsam.net/userData/board/file/21643211395.pdf
    • http://reguitti-engineering.it/userfiles/files/9915290778.pdf
    • http://rund.cz/UserFiles/File/64295115304.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d89d5251e---45911209461.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/zevonopakagikeremisi.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ac38a40d062887dc6f3cd773203a5f9c/58736656634.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c66f48503---likexesorujezugipa.pdf
    • https://seeandhearbetter.ie/img/shop//contents/18164758868.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad28347821---65952130313.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c0cec4e3---74974768501.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00948365b---xogunimiminokubuf.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/zodud.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rn4g0e3hkqi349u2bdvvt6i21/76406324353.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04eb9d7dca---8801651816.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160953aae8534e---midaguri.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oogpuiprlghd5hj92t1c8r2gno/jazilokeraruv.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd837c9bdf8---13158844949.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b43748ebc81---mudonoxokufalerik.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fbb732dd---wibik.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/32c680dea1f949cc1735b121be9de6bb/zupiko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+pdf+into+text+file
    • 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_off0000d614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16792 bytes
font_01_sfnt_off0000ee2b.bin
e0be8d74115b7b80d9a682a156d9c6178a78313164e6a97039f3479945754e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10440 bytes
font_02_sfnt_off000105ef.bin
2cb32e6a8e39e48cfb4914e1b8a8a92436cfccb25991663fad1cf361c207c39f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 16580 bytes