Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0788660606ffd53…

MALICIOUS

PDF

97.9 KB Created: 2021-06-27 01:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4b6f001960851f975feda3d18ebac29 SHA-1: 87366c9891f6862ab1be7eeb10e67cf93b0a4d60 SHA-256: f0788660606ffd53f9ec39d5bb06f7b0f1eacd4cb9f0db6be8dc212802bad87b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of numerous external links on compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac792cff7---zudovilorene.pdf
    • http://envigest.cz/upload/file/20793698165.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae6874d95---rirajerexike.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c69028541---52253401727.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ba0dd144f01cd166557ee976c37a8a47/41618241158.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082466ed5ba0---55989187814.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/jewamedelisabanabet.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e550644e---54752287224.pdf
    • https://businessservicesuk.com/userfiles/file/59397890392.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rir9kcmbb99o5utc1lqoj6u98o/nezoni.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/r858miq11og7am2r5q3e8190a4/wubukebikawojobum.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c9ad0b3d36947b37618f64dc7aaf0acc/63336839853.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f2bba31916e32ef875ef2b8bf44f9ab7/2884942301.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1c5e23e9---lujeje.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d78a5b2d---45707511654.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/siwemod.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/inc2b8f001e7p7fao6ffif0s7l/53592230483.pdf
    • http://fsoa.cn/userfiles/file/sudibifesibapevataw.pdf
    • http://abacusnancy.com/userfiles/file/kewimozizinupajenixejosew.pdf
    • https://yepsell.com/userfiles/files/toxazewiwupasezo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44fd29052---vuwexijex.pdf
    • http://aaaexpressac.com/userfiles/file/47422990913.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74619509e---nofamekawumivelonuxa.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b44ece379131099fce82e1395aa9f717/nutaxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=beautiful+words+starting+with+u
    • 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_off0001171b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 16792 bytes
font_01_sfnt_off00012f32.bin
0500e900e9e963f43a2b701673e0da79e5db1e78b30c784638e3642ba7011568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10872 bytes
font_02_sfnt_off00014819.bin
13c3984c4056e56249031f066fc354d582aacc1cb965acfbf61708274fab6517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 19576 bytes

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