Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf44ddcd5caaf3…

MALICIOUS

PDF

100.5 KB Created: 2021-08-22 05:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22d7af6765f797e2e08b521c59935bc0 SHA-1: 9509ecb76b73f545cc74bee4ba64405e8aa3a8ca SHA-256: 78bf44ddcd5caaf32240d07ae9ef99f7fc36f6eabeb516bdf2b5bc7c8e1597d0
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites that appear to be part of a link farm or hosted on compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://amgaa.org/temp//files/vatamekogepo.pdf
    • https://ecosolar-energy.com/piceditor/file/sidapabuti.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde74804957---zedinuk.pdf
    • http://vendingchat.ru/uploads/ckfinder/files/82579899634.pdf
    • https://nestuby.com/userfiles/file/62645950549.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c245000---nadugututatuta.pdf
    • http://to-tuong.com/media/ckfinder/files/28530732762.pdf
    • https://birotex.rs/images/files/pojixizoje.pdf
    • https://xlspandoek.nl/userfiles/file/19359414561.pdf
    • http://adams-gold.ru/archive/image/file/68411496842.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb5714958---90644217254.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/91853788934.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a49ff53---porafipiduzetolulunisim.pdf
    • http://jhdljz.com/userfiles/file/1626122164.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/81465536617.pdf
    • https://gregor-biffiger.ch/userfiles/file/54447611203.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a036daacb---8167709458.pdf
    • https://bandai-k.com/userfiles/file/67851802791.pdf
    • http://apluskleaning.com/admin/images/file/puzisagukagepijisonuxun.pdf
    • https://kop-trans.pl/uploads/userfiles/files/71535849032.pdf
    • http://www.herbertvanderbrugghen.nl/draft/xibopupaxidonida.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/24692350909.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c236ec8151c---kotafabimaleni.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d4546b9e---jakejaxijekit.pdf
    • http://nextgenship.net/upload/file/20210608162312752855.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tajweed+rules+in+english+youtube
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ee60.bin
9eed4cf551af6813853f676d2b7288f2f0533874bb6eca45da8760c9ce71edd6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE60 28808 bytes
font_01_sfnt_off000122b1.bin
886b9a218894a12d65509625a41cff707fd2be9717e763d61171528a12e9acca
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 11060 bytes
font_02_sfnt_off00013c2c.bin
f593ea236aa3aa81ae62d1fea61cb6219e3cedcd9ec521fd2dabfe607244d3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 17300 bytes
font_03_sfnt_off0001694d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1694D 16792 bytes