Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af87280993a388e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 13:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da52f51617e93aa84a9e84b3a7dd2659 SHA-1: 0a349450c89ed95cced391b8c299c0d3bd066ff3 SHA-256: 7af87280993a388ef430f2669d26265d129034f399460ece58a2e297fbbac732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=saphirblau+buch+pdf PDF link annotation
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/56qnmlbr7h9bma3ref4k586js5/58646345992.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/sawujojedebapomegipuzizum.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sowogefema.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/budimamuvukanurip.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cl2rcq28f04791o2m8d47omdq3/44689105652.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d46e8d91d---betug.pdfIn PDF document text
    • https://harmony.im/userfiles/file/24735165253.pdfIn PDF document text
    • http://canoeing.by/pics/files/19820275965.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93791695962.pdfIn PDF document text
    • https://fallsplat.se/file/86614833417.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/39831620892.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/kajazakemotekumikoj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073edbc74a34---zezepinumurotelatim.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/26952396095.pdfIn PDF document text
    • http://www.toptehnik.si/images/biwizuxemasimewobajosafed.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/677f493f3a953d912640f2b14d8c8f72/25498548976.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f29e9e99---96297397178.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdd8d9bd5---wabatulunagimoko.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jadidanula.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/08010eda9ee0f5a40b8289dfd7e348a4/zenegajizavolezupupuju.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/cbb6926471e2a96f7ce0eb4aeeb5ffff/9501540937.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/61468631559.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/dfe20fde781b37a5e24e7cf9519c551f/mikave.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 20684 bytes
SHA-256: 8bacd063a7f837f2b30f9e41705680f1c107ddac056cc9d721e3c73fe058f2eb
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 10412 bytes
SHA-256: 3edd9033ea45770d65990fe4b56d2498b78a2690e94079f28caffea442207e7b
font_02_sfnt_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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