Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc21c3b8f4caf7cb…

MALICIOUS

PDF

96.9 KB Created: 2021-07-02 18:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d040bea0d51636c15747a807367bdb42 SHA-1: 82ab0b9cd985123c63bc0923ce035a4da2a5b6f2 SHA-256: dc21c3b8f4caf7cbde20335c29620dd9319de9cbb28f79fe2525af3970e04f9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c6f8d241---dizomasuzogamogebefuw.pdf
    • http://www.moyekolodin.com/files/70555524429.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/zafav.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/786db58c77431c7e98cd6a0170f96e45/xekikarez.pdf
    • http://valeneighbors.com/userimages/bevun.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b13b903a0---95316016048.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b413577ad90---lunutam.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089255be71---poxulixolowojawujo.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/i2a50725q2q6jmka8fjjdn53uv/gedoganomiwijego.pdf
    • http://topcudental.com/img/userfiles/files/piwexuj.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ebu9ur37qk6limvadeu1lqeg46/tokojuga.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f856b68b2a---dudowopedarag.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/73eb2e14b1a0a9a4249e41536ddd916e/37195680590.pdf
    • http://pappteam.hu/userfiles/file/zuberodakojolo.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/itki2kvic97ekq91f6ulbia8hv/gogujutopetokawazagufuzi.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f32f3523f---waraxes.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/gokabasixupumerup.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/18140008765.pdf
    • http://bindashnews.com/userfiles/file/tawajomubiworefo.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311977956d---40472937142.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfadb0697fc---50601393945.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/36880727816.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/66j6leuf9vgdkucvpa3c0jm08v/mogiti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ducts+on+call
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ae959cc8---kujuxufisibew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcce.bin
fbe8221a5e906b97ebc95d4e84a22e798185c8042d0dc05985856ca38f74834d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16904 bytes
font_01_sfnt_off000128ef.bin
a5962981187509496acb664ec930c7e32896ee7da7ee472b34e1adcaea0492e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 18324 bytes
font_02_sfnt_off0001466a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1466A 16792 bytes
font_03_sfnt_off00015e81.bin
c7c39d3858e5ea5e9deafe0cc9f4f3eb9a5780ebb30d2ce5b0e88c542feeefd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E81 10000 bytes

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