Malicious PDF — malware analysis report

Static analysis result for SHA-256 7131fcb8b628ea32…

MALICIOUS

PDF

86.2 KB Created: 2021-07-28 03:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f40b06a5125b7bebbe1242bc0847f424 SHA-1: 6f43f4f5695854dea5864a1e259bebe67e86f371 SHA-256: 7131fcb8b628ea3219ec93a0e39e1bd2addcde0a8288c9d9aec8197caee3e032
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to leverage these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/686d744e39362962df182463f313ed00/40170959966.pdf In PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/65223398348.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987644a327---tikewabevapikowadipu.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/kerevuzulojilivudat.pdfIn PDF document text
    • https://nadamasristorante.it/file/nanutoguzebubirapeb.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af3dacf06---viwixenof.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/67860785217.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/758a676be500f588e853c6eacf6beb4e/tukitufebisukolavep.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/69746970469.pdfIn PDF document text
    • http://tcihk.com/userfiles/12494552666.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/futizawi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918381eb42---xatafalemaloweve.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/bokez.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/jonorofogajavidaxazije.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hl2aj2m6005g6f2s6l5v7af707/zijovadetiberekak.pdfIn PDF document text
    • http://salwex.hu/file/2953392681.pdfIn PDF document text
    • https://0900107678.com/upload/file/58742905781.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34309db8bb---26113475095.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/2994038177.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/puzugijurisemumu.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/90073596441.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5avjnhcav2a6gmaq94p2f0dcb1/26286651503.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160993c2f91008---negorekigorodogawilomos.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6624760791.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1930f9e8b804f20f4100d6af5b31084e/sugikisowamavujowow.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dffb3ec6d---xekabekepuvagubopivox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+ihome+wireless+mouse+to+macbook+proPDF 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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 17008 bytes
SHA-256: aa469e44ddb847ad09ca46c6972a41b5965b90f6544e8f22a4242359be1b7a77
font_02_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 11048 bytes
SHA-256: c713deaa1e505eb8dc697f1d58f6515418e8db5649fbca81b172e794f5dd9108