Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2c675ed61a475e…

MALICIOUS

PDF

92.7 KB Created: 2021-07-22 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 95dd2c5356505698a73e9e0001fc0389 SHA-1: db384a92385c6ec7ef032fe76a3781ab6a192e6e SHA-256: 7c2c675ed61a475efba0f470abc58275cc26b1f2d19c79c3110c6ec6390deac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba07e18ef---71761151154.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fdeae7071---merebukonezanasetugevep.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d14d9b8a0---zoruzer.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/63417030284.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c566bea846a---pubejotewefuniparem.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zudubodadosefixifenelut.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d1774bd4880de4a988b95e6b3bf379a8/xizewigiwulodujosaxuzu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abade69a156---78487706463.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vuxap.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/kobeful.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/59097765121.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a521b89364---22491672726.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/14087451065.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gapufizususifoxu.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/zumatobekitukixivotu.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/tezatunaze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a54cb3c0---92578804083.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qt0q4drjc0o2s6iq6j7s68td3/vazaw.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/zokovutusazigeb.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/25690190524.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad91769092e---keribid.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f477accd5c---55023673962.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/99505653406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+office+title+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16628 bytes
SHA-256: 45380fb9c3273dbff9b58c05d3c376748b6e74be4581952706bc920728196f14
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 17676 bytes
SHA-256: ea3ff6471eccd215936531fb5c642963017c8352a4dedc8d56000edee2c0b1f7
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D49 10316 bytes
SHA-256: aa1bd15425a13d296f71ecc40067837b43512a7c113283cc5165440df7e293bf

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