Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff7e4762082b286…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 20:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c1c6de950922f6ab39eb809194e8cf0 SHA-1: 6c563cf8da92fa2c9298bee193355b20a2ad8ee6 SHA-256: 1ff7e4762082b286effbb1e625b1dae56b665be745dc15c4bbc40e1cd59e2d4b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest the document's primary purpose is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nenuridekorevita.pdf
    • http://www.annaleehuber.com/content_files/file/jogefidoguwolaro.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077b87d9c---69984230708.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7cb3812---zefozaduviz.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9d8786ee4225fc110a317ba421802dc7/julaxizasogopewupe.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7971a2769a---fubosotugul.pdf
    • http://villa-carlshorst.de/sites/default/files/file/fevegasedetuxujupeboz.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956328383---garupawilusodujogijonux.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o8cuuv4tvbkvstcjbemsi7fijk/17135267687.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b3daede4---24481651675.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/18f08040e1ddadcd4256aef45ff65982/revaloneguvetej.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b990b0262e3---zimekubizijafurekomiw.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89dfea960c---15819301397.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efec1c1b6---51383504221.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7475e60e02---95816189497.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa861ba9f57---mupelajas.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/fpn9adr0k0kfde1fh7jul5lbl6/ribisudavorukerak.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/357273239.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/161b8002c994df9ea5116ca512915a14/23773145307.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607815744ab12---58728277126.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ek9al2h7fkfkm1rs6sh9tvsuc1/veguvo.pdf
    • http://allasclub.com/campannas/file/vamipulesazavomoze.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6056832a---15954097081.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/k8dp8frj9hqv4gj2oe7e5e0s76/tedonanufuletanesanekav.pdf
    • http://arcomproltd.com/userfiles/file/zakarixaxusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+a+cell+worksheet+answers
    • 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_off0000ef18.bin
8a1071341d9b89f06e6ecbe1c406d81900d93b66d0bab313d15806bacba3bb5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10500 bytes
font_01_sfnt_off00010701.bin
07f09cca34a04c230bd05dda2066fb5cdab4d26f02bf3652281ad0207fca1518
pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 16972 bytes
font_02_sfnt_off000132df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 16792 bytes