Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b789656316c266c…

MALICIOUS

PDF

134.6 KB Created: 2021-07-15 16:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9566f4d2a0b886b04d0b85423848c24 SHA-1: 7c6e0469ddb88bdf2c672c65df8a32feb15b5f3f SHA-256: 7b789656316c266cde23862ef843e6b7b1a0ce23beb4738ef8848398c1170cec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=the+muppets+scrooge
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216291414315527.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/41gltit852v36klclg9s7aeih1/88481941183.pdf
    • https://thietbivesinhanhhuy.com/asset/files/lakuvojiwodikafi.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/60b796c4db2882255e490e7bafca50aa/vewimimojekowanujilaf.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c6ecf879---77870752682.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/596cshurm6ks2q7g7ajhb3on52/29322598674.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cbedef5419521bd71beae597d8e2cfcc/repazilosipa.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72d33fc5---92732562953.pdf
    • https://itchanoi.vn/uploads/news_file/punomepepawenakugo.pdf
    • http://jnnycc.org/userfiles/file/tivorerosugigab.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077329ba6b5c---10409374753.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/72ec72c89bf3eb18ff84bb24309dee25/tutinupijisofutezeki.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878350f047d---daruzasig.pdf
    • https://branchennachweis.eu/userfiles/file/79699015435.pdf
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdf
    • https://contabil-fiscal.ro/mm/file/43041058406.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc2b166e8c---12649883160.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/81845400545.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093231818de9---zisifuvub.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46586549e4---20444529508.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f21cf12ff0b74e40285cd5b5f95655c8/kipojagikaje.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4a4dd018---2017009423.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i1nnko5kncc24656ofpe9uh8s5/77514657683.pdf
    • https://signika.pl/Upload/file/92931971571.pdf
    • http://moscowprice.com/content/xuploadimages/file/sopurovakediwotimuv.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a364e9d4f---wawivugegogebonuxunemaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab1e.bin
2716e7371a1c20b614b0cb2a2d6b7b152def408167995bbfa097cd0d965d2940
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1E 19492 bytes
font_01_sfnt_off0001dcfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCFB 16792 bytes
font_02_sfnt_off0001f512.bin
17d5d98dcabe38e00e3d05bd3f89327b8b757df57cdf8acd9c9edecafec2eeb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F512 10480 bytes