Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11ec0a13be3ef43…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 19:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a90f1f163150417a4707e5bc06acc103 SHA-1: fa7f9caa69b3db04fbdcc72abb38a1fee41bd7b9 SHA-256: e11ec0a13be3ef4325d810b491c049bf88f13088bc0ab16e96873a048a86dfca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of external URIs and link farms on compromised CMS uploads strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ketchas.ru/uplcv?utm_term=autocad+2014+installer+with+crack PDF link annotation
    • http://khyljg.com/uploadfiles/files/57979192529.pdfIn PDF document text
    • https://aspirans.com/files/file/88051131137.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lotusinivejogaz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ba0ddca8---38028088901.pdfIn PDF document text
    • https://laser123.com/geektic/files/79630110298.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u60ce4mrttl1vpndntc6rje30p/tasofi.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jixigokutonixu.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/52430093561.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nenuralaxabisu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f96ec68c1---logeponaribuzifizu.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/49074186512.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f01f49ffa---fejoviwefoboxagatuzil.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/ludunebubiwarekewug.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vumefejulufigejosu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7997e1f45---38968929144.pdfIn PDF document text
    • http://www.celso.org/download/92253405211.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/sawusijobigikodovezasaxi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3098052304---gofutezugedisepatide.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/vupuwefumawowojuvebalol.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tsp8c7tn18945rue2r4a499iv7/63982382438.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/15651751833.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/62642445493.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0stp9cdnm7vietq2micilkrram/19144860546.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a160590d48d168c05e896ad99d664fa/41213965268.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ci0iu76npbalh6p198rhr379pq/pekowitomex.pdfIn PDF document text
    • https://taperagi.com/contents//files/kewimid.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/93bb2a481a1b7f7e5f0bee12ab491ac1/jolukugukager.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 17484 bytes
SHA-256: ddc557f554299ea4041848c3980f9ac932d73d01f69ed8ea0d140f4ede350d6d
font_01_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 11100 bytes
SHA-256: 37df56842f8eca86aa3f0c9e7ecfd9189d3e2d63a4f75edecf2e7a89f3e04a63

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