Malicious PDF — malware analysis report

Static analysis result for SHA-256 da25487e1abb552e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 13:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e380ff5e2ef8ec7149092ea62b4cff7 SHA-1: 72f691dacd52bc616827037f2f673f85c4dde97a SHA-256: da25487e1abb552e709909f11c131ed9c9c86036377ad95307a2fc108c9c0e37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, some pointing to compromised CMS upload directories. The presence of a visual download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=dhoom+2+movie+download+720p PDF link annotation
    • http://gr-chem.com/upload/files/disixewusovizusojowumun.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jigufamafazitafawuziti.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4f90f193b8113f32df64985ce9b7531/gipebam.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161380aa5c9d25---64019206183.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/biwopetekiku.pdfIn PDF document text
    • https://novitas.ro/files/lukuw.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109190312208245.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/17117272717.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/83321949132.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/52284000969.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907050317.pdfIn PDF document text
    • https://hot-pol.com/images/file/34663481826.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xeruwivelerivesaxi.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/7036404349.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134528c818f2---40668601601.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e1477d6a62ab201ad07f90997e3bd17f/50185009797.pdfIn PDF document text
    • http://mousike.it/img_ins/files/75707946400.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6247c23f---98431434253.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/bepipeke.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/filapilorux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161437bd74a9e2---relaropeduwizeluzobuwuzim.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/73877576753.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/zebomuf.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/88525998538.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10736 bytes
SHA-256: a5a30815978b552f150cacc8a928bae0164583af3f8c1d05d3ebcadb00e4eb1f
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 17224 bytes
SHA-256: ba93993253715574b11067a344274ca6a785a88734565a174805f7a2aedfe77b
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1