Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ceb6115160507c4…

MALICIOUS

PDF

74.2 KB Created: 2021-09-29 04:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86dc5021518412e318c4f5dfe0703e20 SHA-1: 4e57fdbc447b90af1dc0071ecf37352691abb18f SHA-256: 1ceb6115160507c46dbc71b576b47842bc095d166ef12e2b41eaa90741473f5e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with many external URIs, including links to compromised CMS upload directories and disposable hosting. The presence of numerous URLs, many pointing to potentially malicious content or phishing sites, strongly suggests a phishing or malware distribution campaign.

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://catamma.ru/uplcv?utm_term=roi+na+mp3+download PDF link annotation
    • https://styliststudios.com/imagesTE/file/82061849792.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tisogabudebabagebabibokuf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf05358b9---fazinitipese.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/zoselizawo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16148899e40bb9---mugajuvebaxig.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/tumaxota.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d57603c29---2852125162.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/guzazewerelulitar.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/gamejate.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bk554t3kkeopmm3gdpqtm257g5/kixujuwozeronepidosokoru.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/xonirizijovenigime.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/zamelado.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1gfsq8j8p3uhnl70lj13hhjc8c/dapasafi.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/zogudu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/31788135840.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/diwikutofisobuzorix.pdfIn PDF document text
    • http://cosyromania.com/media/file/69179363270.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/91953790312.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pakapinenajem.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ogls4t8pcv7p9qk58thj7f200p/68142103609.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lolutotavevulako.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/43422811620.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/80766121389.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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 19212 bytes
SHA-256: dc1101fba419d08b459cfcdc5c7c73c013cd60fa3435aae177e9fc27d2c20905
font_01_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10356 bytes
SHA-256: df572d98c67b685693b66a46ee76cf4aebc84aabdc607c602f97ba2c0a704a61

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