Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc1fea6a6f8447a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 05:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2eb6b4eb7a1dc96e3ed58c346decee97 SHA-1: da772be8cc5826134d4bbe8bdce892e9ebf584e5 SHA-256: fcc1fea6a6f8447a018d69a8058e15bb22dd965d2d20c48e833766543b6947c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to lure users to malicious sites. Heuristics and ML classification strongly suggest this PDF is a phishing trojan, with ClamAV confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://cappellastudio.it/userfiles/files/rudigufib.pdf In PDF document text
    • http://edv-denk.com/userfiles/file/sozoxuvugegijovo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fosokoxalegoju.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d2869fd92ebe99b882b9eacbb513791/70745514209.pdfIn PDF document text
    • http://anpharma.net/upload/files/luvutitonojifepunagi.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/96500672998.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/93389732881.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/75881202975.pdfIn PDF document text
    • https://qkon.ca/images/file/furokupexilaxepilip.pdfIn PDF document text
    • http://grabnerestriche.at/90657067141.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/powaf.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/vanupoli.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/4787760658.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ruzilisojedolupub.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/goledej.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vibizujivewewefagobo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614806125f9f7---lufuxodugelavujunopof.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/betedewulonif.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36809471148.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/8095326378.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/fifazederofuraxotan.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453e4b8a630---lesevi.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/42515915055.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161331d67572cd---11710605322.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/31235326133.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/vugetotiwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=integrated+marketing+communication+mcq+with+answers+pdfPDF 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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16472 bytes
SHA-256: 4844553b727bfb45e175aa75ad8217b6865aa77d6622749964bc84d2dbaddf1a
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11396 bytes
SHA-256: 2d3fc55f4b3840d17f4eb4e2a830d11b1c451b8f9406673f6e74e3e64f9d268e

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