Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0f071458df7f50…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 00:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a21296724ae82d36684422071c97be83 SHA-1: b914d87a41d03cd25f4207fe3a8331a876f10e10 SHA-256: 0a0f071458df7f5065bbcd7e5f3365b70fc4d84ff4fc9e214dca576f43ed99f4
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4ead97fe---falulotowezufavowofineso.pdf
    • http://nasfthr.com/userfiles/file/84734021013.pdf
    • http://getsolarnj.com/userfiles/file/20188637619.pdf
    • http://quartierdete.fr/uploads/fckeditor/file/88860996481.pdf
    • http://files.ibiza-ferien.de/file/banamawefixolufen.pdf
    • http://epwuae.com/userfiles/file/bedojexo.pdf
    • http://hotelamadeustorino.com/userfiles/files/73228497306.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74489315682.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/51545989551.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/49101758987.pdf
    • http://proreferee.ru/uploads/ckfinder/files/7924778136.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8f71412d8798b0de71f0ddb3bc33fe21/fikome.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d838c5b3---26859436548.pdf
    • https://comfort8889.com/upload/files/38215140351.pdf
    • http://asqcert.net/files/files/renuverotedenukelabig.pdf
    • https://sunnyrosesschool.com/userfiles/file/64370441282.pdf
    • http://corising.info/sa_upload/userfiles/file/20210910022716.pdf
    • https://wmu24.ru/media/file/vaporimiwigukuzelisufo.pdf
    • https://flyags.com/editorResources/file///jorobidivosuvadoz.pdf
    • http://hvezda-pardubice.cz/files/file/80090925919.pdf
    • http://thedreams.cz/files/sumenigorobijolog.pdf
    • http://violetstudio.in/userfiles/file/94617874940.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=justice+league+full+movie+in+telugu+watch+online
    • 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_off0000e085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 16792 bytes
font_01_sfnt_off0000f89c.bin
54a2ae0cb5c8dc8082ecde789605b60ebe13c77c3ec234e786ff7b4fe1c52917
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10924 bytes
font_02_sfnt_off000111da.bin
a0f6f2ea7afefe51dd1a2d60eab79af7b7ce5c0486b3fd1d3e66f7bc01607199
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 18348 bytes