Malicious PDF — malware analysis report

Static analysis result for SHA-256 f432113e400464f6…

MALICIOUS

PDF

92.8 KB Created: 2021-07-22 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d69f46f8f2a0968ef195ec47f220afd SHA-1: a1bfb2a0d4c741e348fec3ed32118f5b5c5cbf2a SHA-256: f432113e400464f6d7a2e3517add5ffc97b2c9825b3b97743f6bf15cd72583c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing by directing users to potentially harmful sites. No scripts were extracted, but the link farm structure is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/lepudegojanujigusegogus.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b488a3a77---foramo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee6cceef0---fubolujaji.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xozobikib.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/40526411801.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798bf728607---87681341754.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/boxulanowusugariku.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/4579005374.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dba05a34d---lawavovejif.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf907082d9---veregedasazozobopo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083279cf370a---polebejosaf.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c22fa3b38---wewafijorujedusixonunavim.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/lidevezerisulu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/765ffac561ec426a31bc439ae36cd01a/fewedesab.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c827ca2a3---bunifidozupunexajetid.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/94379526866.pdfIn PDF document text
    • https://taperagi.com/contents//files/35693250363.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aba1c3b7fee7007564e1282fc2ff710b/95917807006.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d4e0d23973ceca22dd6ae1bde448b610/55995008493.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d5229aa22504091cb0efa5eff8ed7ca5/54002588535.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b63bc3295b3---21904942813.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088abb63264b---miroxoraxilosetuwet.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a5b480e1efb52d8352bf9b40e613b68c/90769853886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tractor+of+the+yearPDF 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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 18424 bytes
SHA-256: 5d28ae9085c329937f9a69eab3e9629f45ef56523fad3baea8b7e270a7d550dc
font_02_sfnt_off00014da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA2 10100 bytes
SHA-256: ce5b17a356adbd355905857ae8cdf08677519f6720f399d49788e7a99a974b46

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