Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1a726fcf79e72…

MALICIOUS

PDF

82.1 KB Created: 2021-07-26 02:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3dd7d8b03b9e1c67ee3cd547d89d65a SHA-1: 422e6dcce6967595d95963acb4febd6843ba6328 SHA-256: 16f1a726fcf79e72e052ca3414e03fd4d5435483fd2e91e336d02fb7eefb1bd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ventiliatoriai.lt/js/ckfinder/userfiles/files/famowul.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d297d802c---tudad.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b776ba806---77166299377.pdf
    • http://www.toeterloeh44.de/files/5754289776.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mararexujusunovibavasuf.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d752b1e07---mevutabo.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gnk3snkk64l8om953br8nebgus/punoj.pdf
    • https://altonika.pro/files/fck/file/12245392131.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ebrtuftl4kqb8jh5sf2qiosln2/sunatipukutararulufobala.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf699b9296---valinovanokenabenanoge.pdf
    • http://elitacasa.it/images/file/tugota.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/k50resn7u2pohake4ibjc52044/ledexinilitudijomejemapa.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff641acb34---64932108923.pdf
    • http://animationcoach.com/userfiles/file/fikoxi.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea6ee6f7d---24395629820.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ede45bc43a1---88423312413.pdf
    • https://dintek.eu/uploads/file/37645734262.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a173654aca0---8813984704.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q11fe66l6c0hsa95g36t5s32k4/bajokumo.pdf
    • http://assushop.com/userfiles/assushop.com/file/muxasodizabatakunej.pdf
    • http://talleresjpg.es/img/file/vebonuvonedapidifud.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed27643ad---zewadasiwazin.pdf
    • http://tuzvedo.hu/elemek/file/towujonedurivaxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=streaming+film+my+stupid+boss+2+indoxxi
    • 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_off0000da34.bin
3e55bd22e76184db86297ea884c699271fcfdd9af94c389d42c843d00d99e196
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 11492 bytes
font_01_sfnt_off0000f50a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
font_02_sfnt_off00010d1c.bin
2ac20f827ae172fe5f362abdcf2776d1974707decf0a4b09288113a3f490240f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17216 bytes