Malicious PDF — malware analysis report

Static analysis result for SHA-256 2889ed2d924875b5…

MALICIOUS

PDF

114.5 KB Created: 2021-06-26 23:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b79a64d925141d65e4e561a54b4f6425 SHA-1: b75623951eb024e9dfc40410f4760ed83ea5b30e SHA-256: 2889ed2d924875b52d2d99accb7af8ae6155ed21300ec0e3bc8743bf3a798b93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

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://laborke.ru/uplcv?utm_term=download+film+weathering+with+you
    • http://sattosushi.com/uploads/files/31332780639.pdf
    • http://gursakaryahukuk.com/images/file/16608900489.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160779b3da7971---tidomibilunafimusibiw.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9080fa897074027038911051383e56ec/69721679913.pdf
    • https://airbays.com/userfiles/file/75275996190.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbab5a6f9---naxatapajejedopos.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210611_8249386891787BC2.pdf
    • https://caribemed.com/userfiles/file/fikobiju.pdf
    • https://arvikabc.com/images/uploadedimages/file/73446477670.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f409dec4---gifuzelod.pdf
    • http://scoutpate.com/userfiles/file/10241391248.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e971f6f5ee---65907536695.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72f49b3c1---69758745957.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080614aefa85---68197399376.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe9eae8fb---83213916388.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb70bb7cc---38068698519.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4b983cd5---9282729579.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tejepevaxarife.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/03c651f65b08cbef03a22ad83cb353f5/rogifokojunumigilobog.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/noc47b1j40uo3ep33gmm4fae66/67624990378.pdf
    • http://radio6deenero.com/uploaded/files/47910252323.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094019e6794f---37692967706.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vkpbt0n99mhnfneu3um6c2dj74/12072463958.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da1d2ec35---46771217963.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efa95fead---ropisuvevefoxiwekesa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013688.bin
4f17ea7b10c9334e8b3377e0ce39670ad47ffe3a2eb5d7cfc4e14c58963ed9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 10932 bytes
font_01_sfnt_off00014f70.bin
5ca65afee66507a78b204df56d703d35a30a6a913753e102dcaec81128f5c4bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F70 2296 bytes
font_02_sfnt_off000159b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159B2 16792 bytes
font_03_sfnt_off000171c3.bin
d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171C3 16280 bytes
font_04_sfnt_off000187e0.bin
682a3e517d2e0447e72c213e80e23abf84f62c9a3821ddc9c5266a17ed5ac875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187E0 19656 bytes

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