Malicious PDF — malware analysis report

Static analysis result for SHA-256 199fd9d5341425af…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 11:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24566635da42e31a6c4c6d8eb412d47b SHA-1: 2279a813dcbdcdc9984404fa3ce367153b275018 SHA-256: 199fd9d5341425af1f84a78e402157210bfa61eeae4535e1c1d70aa3bbf10d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious destinations.

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://betalinktech.com/blmedia/file/70267692931.pdf
    • http://mwflower.com/upimagesfile///52350015790.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f150fa07d7---43851470573.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a4e971f233c9fda8f6b92c33917396e5/28387806035.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607063424d819---jomugaresamosekogowolok.pdf
    • http://alituncer.com/userfiles/file/vijawitezugimorelazujilet.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0f42c51da95862a2b122b181752a1c61/gojavabewupegegugunixoru.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095afcaf0ee5---51976582324.pdf
    • https://cafe-malaysia.com/contents/file/jomazarubugenamuriwar.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a0a3e0fb---35155271294.pdf
    • https://aspaeng.com/files/image/files/sejezelan.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df58cdae3---lomoxofebusawa.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae79f972b7---74474710430.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/227a534adc5b1ce5f55ccfa81af158ce/bufazerinesesanom.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/zuwajosi.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160772cc76fb78---zonegerovefelivedabamot.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/58472030769.pdf
    • https://ptogel2.com/contents//files/fomide.pdf
    • http://pallenberg-busreisen.de/uploads/files/wafibaloperokogaje.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/97388211896.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4tu49m0irsacnp857rnjqcac2o/rejurigesufavixupogiri.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a25e2e3c---92297232214.pdf
    • http://csptech.net/admin/userfiles/file/rolisinozonomibisekedijis.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/38b5941eee609d7fe0a75f8fccaa9fda/25503694460.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=will+you+ride+with+me+lyrics
    • 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_off0000e93b.bin
b70fc6a36c644464577e721b4c9d3a5b3eb93faad7b9e2e240dab1db421dc14d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 17776 bytes
font_01_sfnt_off000117c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
font_02_sfnt_off00012fda.bin
ddea4d14d33c2b5b97ce412cb7163c6f90f5e238f0b1454ac9ffb4c3a507a6c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 10660 bytes