Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e6bf965f02001c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 19:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f9010520ae2dd27f391ae211b3a838d SHA-1: 8a0316a947cedb26890aac5064a6b044e567927b SHA-256: f6e6bf965f02001cebed8630678e55c86467f7932f15ea2fc06e41fd528a383d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the presence of a link farm strongly suggests an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=taenia+solium+caracteristicas+pdf PDF link annotation
    • http://koala-al.com/d/files/lavofudosodikazuwun.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/zexuzugozaji.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/gawidefifanovulope.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/74808211290.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/xomarolef.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb49b6dbf---15800311597.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9ec2001feca70095d6acc60acbee32c6/xibemelemutewonog.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0paqfl2rq8ccujb65omd0103n/98525391748.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cab64d37759c61dfa6ddafa1a3e32a75/suxoxipusej.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/91854708700.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/77934117301.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mozosis.pdfIn PDF document text
    • https://masihpt2.com/contents//files/98912087074.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4579c09806---85273122063.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/82886460765.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/larokerojiguxo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b336b6216fb---godoled.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607c768430401---52108709350.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/kixumiwotezazanenizel.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/sukuvesomewiwesokifopuro.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef6c49b0a---44109190502.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pelatizigenazudibub.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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 16500 bytes
SHA-256: 00233ab6e04dbf8f2e2b03621b232aebc28b0ba8322ee249ca4c142d42b86185
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10844 bytes
SHA-256: cb106ee7b9fee081bc7c3703ccdc38651cc470e5675b1e164456375194d06825

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