Malicious PDF — malware analysis report

Static analysis result for SHA-256 3850f6eaf88a0a11…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 02:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce90a937fd536130b2f21437b5a0ba02 SHA-1: 4ceb06783e3e4dff5ddb7ee82e2867c6cc77db99 SHA-256: 3850f6eaf88a0a114e93d3108b049a27e92fbc5989105d521e00aae814eeb3b6
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=blood+type+o+diet+chart+pdf PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcbf71aaf---47030522458.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609488ef06b7e---39106586838.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/kilolegasesino.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/gutebasewufovagedafozo.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/49147313891.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/30344621518.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cafd4719f---sowafuf.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1877a4539c4821b20bbe2ddac24f243/fowejilizuxetonudogod.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0510d88fe1---41562360690.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/81dad313fe30df4cafdc4ff4ffee9e70/guvinupajesefejo.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/dapowezajabomagurewifupuv.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/26790370234.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/9043562157.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/85929516467.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/93726882918.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e426d5021e---bupulunidigapefesinezugu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc5a9fec6---zusolutagajamivufanino.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ru9pphh84i1ddkfcpnqvnl9bu6/42635427251.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc5eb1c1c2743eb293be30dc089a927d/raxezexej.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/46780560471.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c4bd0d3065e852101e99d5c94b059ebc/87637239763.pdfIn PDF document text
    • https://rm-parketi.si/uploads/tumezugukel.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8cb1f4c8ff60e3b63f255182ee1027b9/97802871848.pdfIn PDF document text
    • 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_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 16756 bytes
SHA-256: cfb8872b75ad1a7dd1b981c7474e53c1d9aa9f143437a18ca0ed3e451751b3a2
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 10612 bytes
SHA-256: a1780cf3b588bef38c8b59045eedb1e105a7ca49cfd058db14d0f06b11051d83

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