Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7404f461e87f70…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 07:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79f91c3995be75ecd161ac0511590680 SHA-1: 38be181a34d370ce859754eae9c90916d48c4f8c SHA-256: ca7404f461e87f708c2a52116ca355ca18c3ed5716526742c60fa08ffdf7ba68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier 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 0.9846

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://medvor.ru/uplcv?utm_term=mitsubishi+mirage+2012+service+manual+pdf PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b66905b256a---40716619465.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/39391080810.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/39316530328.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/pipagaxufif.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082322e4ca6a---69438526489.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260607881d---zimewuxi.pdfIn PDF document text
    • http://espokebar.com/uploads/files/bugelorepexixavifurukigaz.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/foge1ioksg46nge9oi8bka9cch/43007748584.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/fetusosa.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/rojinejekivivinunonibis.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b126286c996c18414ff95d0629a87f4/81189110843.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1c8629e223f01b56e12f07ede79c0977/90057006343.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/85154559581.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xofiwipivafebazo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/imo7g88sclf11slp8qq5ilb9do/vexodelasedewigi.pdfIn PDF document text
    • http://lukinserv.hu/file/35520784667.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/mukox.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/80709800784.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sikowemovezikutusaru.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea7f38b1---mejifozepanu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32806068702.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/39bfc8653c39acc2a2354992727cffc6/kefubexeroboxovozapani.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/5668484937.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/78046280528.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/34185566799.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210817_865B168EAAFEAD7A.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_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 17296 bytes
SHA-256: 9f127a69131805f4d6267a7c4d88ba3495185aa095f69cd1775405757e563456
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 11540 bytes
SHA-256: 394b4e2a0c470e18fc29bedf43a8f151da5a8ab2f09a78907517b3f556e96a0c

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