Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27f0bf3f97e4ad6…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 03:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4754c6f96176acff608eabc0d3e3e734 SHA-1: 339af4fee5ccd87ba00a325bb720d7ab5b809a1e SHA-256: f27f0bf3f97e4ad65d0e51507bcab57503e0b33a00c1d15fa25c9242f77f0d40
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm pointing to numerous compromised CMS upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lesura.net/userfiles/file/lafolaniloji.pdf
    • http://interface-referencement.com/userfiles/file/16984766446.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cq3gas9o9dgjr379qs1lhkm50r/83016668503.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353d1e5522---45253672810.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb39bb6c7a---welibit.pdf
    • http://eva.am/files/d4e93f975ccc6d2b.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f05beeb2---zenorakojedizigurebo.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/63180081198.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf0387269---60529139929.pdf
    • http://onishi-kyosendo.jp/archive/49879012703.pdf
    • http://edu-family72.ru/content/images/uploads/file/gaturepuwagak.pdf
    • https://sonntag-immobilien.lu/userfiles/files/zopopesajogedojilewinu.pdf
    • http://riskhedgetech.com/uploaded/file/1414712935609269a8d524e.pdf
    • http://vom-ragnaroek.de/uploads/file/90619914407.pdf
    • http://www.520amis.com/upload/files/xipobavun.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/417403214c1454ed5c43cd3306869541/xejuxamabos.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f89073a033---82329821544.pdf
    • http://splogservice.ru/content/file/nabogexuji.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606e91e51e615---34062931054.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcfe11ecdd---13883391838.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd1a212a212dabdc71316d0b769c41c0/dobopaganasesine.pdf
    • http://fittbike.hu/files/file/xufeves.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091531972d6a---watujex.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/64689018932.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6cdc425---68830420605.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=victimized+in+a+sentence
    • 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_off0000e4fe.bin
9bd6514b3a77987eb54a6a25da751f58c79bda23c37c478e84201c15f0caaa62
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 18400 bytes
font_01_sfnt_off0001154a.bin
aff3e790d5f24b9d895515901b166b9bf7ab7f26d252ca5f701d030168bd67c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 10292 bytes
font_02_sfnt_off00012c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 16792 bytes