Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b35685012780b2…

MALICIOUS

PDF

79.0 KB Created: 2021-08-26 02:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4957b79d90b9b041a48e487a9d0ed052 SHA-1: 75dda9f3e7b89129cd047163a76d1c13dba31556 SHA-256: 00b35685012780b29ebf781a0a3f3df04ede579dc4ca54a8d099c6765f45c36b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inercial.es/uploads/files/bozubeg.pdf
    • http://fittbikese.hu/files/file/desagumoverinopazije.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/22956526731.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9ff870f8---poduviluma.pdf
    • http://www.yoko-ono.be/images/userfiles/file/42668059963.pdf
    • http://navigator-33.ru/media/file/27971430283.pdf
    • http://etpatatietpatata.com/userfiles/files/lekexegukagalofew.pdf
    • http://botosani.ro/img/uploads/file/1580809676.pdf
    • https://saatyapi.com/upload/ckfinder/files/gatufaxogaje.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609699264a7df---lowebuzafela.pdf
    • http://serramentisiciliano.it/userfiles/files/60568121082.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/kavofidunamoketeperul.pdf
    • https://ddshower.com/ckfinder/userfiles/files/51604153910.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f17477ea4f---99692876158.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a7c89ad43---23496025994.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021510833231386.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8723b180---nuvuxuxiriro.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd158a16---zuwegejibasotixukemapipox.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/funuparopojebanefifuzej.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/enjqemetjetulq9tcgt0svpqr5/97725433267.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3402aaa8f---zigirepalazibapowuz.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/acb0eb1e09c124addb8742445ba452fe/76914094631.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=when+was+the+first+telephone+made
    • 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_off0000d221.bin
8f054b162c566d608fd4dbc2615525715632793b8887693da51b2e4cd144b46d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16608 bytes
font_01_sfnt_off0000fd56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 16792 bytes
font_02_sfnt_off0001156d.bin
ad8e55bd75594774e4f147ebcae56f73c7437eebdf8778fcf3c050503630e86f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 10844 bytes