Malicious PDF — malware analysis report

Static analysis result for SHA-256 974c0f0df79975a0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 13:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e1a334d1b3f282cb3807f1568b86ef3 SHA-1: cbdf8758d9146d5a4a91071b2b819edaf9d277d7 SHA-256: 974c0f0df79975a01b716bcba74a219ec11d14a939cf0101158f4bbb97abfe3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://meandnetworking.com/ckfinder/userfiles/files/xutik.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/82366821018.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uamf4d9oc6vqfb8d4kvufof9v7/nofowogakimotenegol.pdfIn PDF document text
    • http://skisun.it/userfiles/files/jikonu.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/viduruzigozifavegoriwanog.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/60450222673.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/78553999566.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/46429722319.pdfIn PDF document text
    • http://synfarm.com/upload/files/75215578927.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/42642036492.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a916245c9---23130897590.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wewabida.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/4876942134.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/valugamu.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/67463749536.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/vezogepuninivorekanu.pdfIn PDF document text
    • https://x-software.cz/data/file/20596513847.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/43849791297.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/37699596193.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/dezonu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/62kkm64vv0mvn467t3a3l86ko5/gofodezo.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/78712323807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=apk+reports%2B+proPDF 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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 17536 bytes
SHA-256: d8e4c315b299bbc04e626c22d080417715660aeb124c9fdea2b114599440c1b7
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 9916 bytes
SHA-256: 6ed2901bf3cf8b664883a9f72d83354b910d3eb8eb24ebe160b8d60ac34e943d
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1