Malicious PDF — malware analysis report

Static analysis result for SHA-256 782deb3c0c3fe14f…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 22:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7697078b4bae3ca149b1d7b34f03b638 SHA-1: d5cc89d9d0ddedc8c81aa40a4e57d75633fb66b2 SHA-256: 782deb3c0c3fe14fc9c21d21bd613516878c1cc53ccfadd10c3572cae855abc3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://pistant.ru/uplcv?utm_term=time+of+the+magicians+eilenberger
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/k1godfnd43s1bispd31bpj5qd4/gajogemux.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9c788ba3---volajujamabuvejizet.pdf
    • http://shipsupply.ru/userfiles/files/rujam.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53e24299---99872130758.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe58e1bc84---jebip.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869562ed7ad---23451985089.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b49821716---28674184359.pdf
    • http://www.northern-japan.com/image/upload/File/76288692259.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2c16f935bb7fe2343d96924c6a59eea/ladaku.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf2501564---vifujusefifunameboni.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/05f2870d759000d43f1272690ffe8ebd/nazadovuvom.pdf
    • http://aldo-ins.com/userfiles/file/73095695527.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/1624493531144.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/49e379760d07e16adfb5771ad53290e8/79762268022.pdf
    • http://baraanduliaptti.org/userfiles/file/luvaseduse.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/dowexaduf.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a08789da---73500366180.pdf
    • http://all-pass.com/folder/editor/file/96256590584.pdf
    • http://banghetretruc.com/media/ftp/file/todakakinirodinosumifefev.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/bgs5del5hh6avv0q7tstee7bvi/69282449032.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7568a8caf969aed8a23c1d78931754d8/zoxijexanemidek.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210605_4F29801EE5A5EAEF.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160900f6534ad3---limine.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2f7c3a61---kuwunizalezajirenuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 16792 bytes
font_01_sfnt_off00011bd9.bin
c93e4d905fb3a37f3c57b96fc88e2d048e3086cbe97497fede0e626769344ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 17628 bytes
font_02_sfnt_off0001498e.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 16092 bytes
font_03_sfnt_off00015ed4.bin
5096f48467ea7d718c05c72ccdd40cd634be47db95e663dbf14bd75c3235cc21
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED4 10888 bytes