Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d6bd7211e5250b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 09:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 512344f81e2a6db0d8be63e257eee4ad SHA-1: 7085b6666a7a07fb77fec78c946b1d5248456988 SHA-256: a2d6bd7211e5250b7c4009605fd0077feb441e5be009cd843e57c50f243e7168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and the nature of the URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://designerhouse.ru/upload/files/65745917770.pdf
    • http://commandhousecreations.com/uploads/files/bulesa.pdf
    • http://sillajen.com/fckeditor/_upload/file/ruxabafexediwupe.pdf
    • https://equator-maritime.com/userfiles/file/zatebuvutono.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e2f1f3b2b951d8f6858efd00ecf3486/51473222876.pdf
    • http://abaj.cz/UserFiles/File/zituta.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/jotemel.pdf
    • http://hilimall.ae/uploads/files/wifebuzawiwoxakegu.pdf
    • http://mai-colle.jp/userfiles/file/relokonobo.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a9510857448---4028865231.pdf
    • http://papianiarch.it/userfiles/files/kaniradinute.pdf
    • http://thenext.pk/userfiles/files/54333674464.pdf
    • http://seattleteriyaki3.com/uploads/files/buzokofaxe.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f61ee563---21261947644.pdf
    • https://parklanehotel.asia/userfiles/file/29340751784.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec79da67---pebedovosumijaxasiwavip.pdf
    • https://nhanloc.net/userfiles/file/donudufawulonaxelo.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/50715699658.pdf
    • http://beijinghuojia.cn/userfiles/file/14489314346.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/55fbedac3a6d419cff859c173f26d13e/lutomimikopeji.pdf
    • http://samafb.org/uploadfilefiles/52759930952.pdf
    • http://s-moonlight.com/CKEdit/upload/files/44101191040.pdf
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f012c41a8ac---gepexibowopizul.pdf
    • http://biomassasia.net/data_ed/userfiles/file/xokapawunozezon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=strategia+oceano+blu+vincere+senza+competere+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
font_01_sfnt_off0000f36d.bin
1bdbf1df735425889c7cd28eb697d66777527c2917d1dc5d4ab7646ae5ad7d99
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 11404 bytes
font_02_sfnt_off00010de6.bin
2e4e352cf86b5b35574aed42b52f527a5f9ecf9f4874337c654f5554d5fc47e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 17924 bytes