Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd261470dbffd1d7…

MALICIOUS

PDF

80.4 KB Created: 2021-06-26 14:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f52e8008138d43b677f449becbc8584b SHA-1: 1119040a5cae8efd11f643d7f7bb1bc568889088 SHA-256: dd261470dbffd1d79f4273174a3244ad3e0cfe5cec8905cdde6e9622d260a280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/51198f59237627a653075d5c24cb4b14/meruxumokugasudapewenu.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1306b4b5---99924185344.pdf
    • http://scvumaichiramen.com/uploads/files/viwidosopi.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ovu822ls10tcrk6bqkmmi5mof1/22092350862.pdf
    • http://pantryscan.com/123cars/imagefck/file/bozelijuwurukuwemugukopi.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f491e925d3---kesisatefuvuzodokikip.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608665b5f370d---63571367094.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b244c1c0f40---zoretevijujegarufura.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/29148595730.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba1017158---ledaliravotewusorupiwus.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rpbrb1p33lkisbnr425pvm6f59/9188326078.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a449d2b92bd---motixowesazefivipaxukala.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1707a1b041---vukoxojapoju.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1ac84768ba31893d7470f91fd685f957/pijoninovitilatutizeson.pdf
    • https://abugfreemind.com/userfiles/file/nurox.pdf
    • http://easyreturn.store/userfiles/file/kitixikidazarotajuz.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/70c5c60142d8a886ad57681c21e623a4/18535504839.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f093c710fa2e80f412695b85b1daf371/losejebelixabasijodivig.pdf
    • http://kurier48.pl/files/userfiles/file/garoxo.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728d61934e5---girorupikixomokafoxavonu.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/civ82j8ts4s5ujfsqofjvkhekd/62292896556.pdf
    • https://alexandrapanayotou.com/web/images/static/file/41696353683.pdf
    • https://defrokatilai.lt/images/files/welavexako.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/33213744008.pdf
    • https://serka.com/serka/upload/files/tilevuwikukakonufob.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad130930f95---sesunibazep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clinical+biochemistry+mcq+questions+and+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_off0000d451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 16792 bytes
font_01_sfnt_off0000ec68.bin
fd882827a5a39b44c0c2f012dcc503ce9337f98faf179b241d373765330011af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 11252 bytes
font_02_sfnt_off00010677.bin
e09a7033bd9ad744c587432c28915ad18460a5717e683d3b9ee37f358f23b187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 17196 bytes

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