Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7233fd0bdd83f9b…

MALICIOUS

PDF

123.8 KB Created: 2021-07-16 09:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24497718fec1eb89c30b11bd140f2efb SHA-1: 0bdd694ad9a1a26110c2921fa0b66426fb64995c SHA-256: f7233fd0bdd83f9b1032df4fb4b29d5ece5e7317941ec4134d340168e7344812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=abandoned+building+meaning PDF link annotation
    • https://medtek.vn/storage/file/52345324661.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e9e3bfad---xaduxovonibiwesafijagowi.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/54918373532.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/buwajumawemekotudi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d423537e323aec645813d0b76a524914/fagerafarunuro.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/tetuxadewo.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/gesafuge.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081eeb387cd6---27938863979.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6aab4efd---fudokitime.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///33100957907.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0a68bcea11ae48c9423fe68776e44c72/sazuxaforenifib.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/02afcd6a5491a8384e7fe4f598f90706/miminezujekuzuzawete.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/tidituri.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/winabiludepirewosa.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/dotopidosinujemoxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4ed28d84---31338498236.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l58kdsapdfp7kru91e9pohcci4/jigugemupedenewa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf55c7cbd6---gokozenomosevifosutas.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/33537796731.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75679836ac---72742562866.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/88926884196.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16226867681900465769.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701811453b2.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_off0001816c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816C 10448 bytes
SHA-256: e091fb72a8b3bbe778f537cd023d049f05d54635c329a79320697f1f2b4714f0
font_01_sfnt_off000198d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0E5 19844 bytes
SHA-256: 2fdcac30d1f0587c503b9ff4b1ddd33dc99db784c670c687f97907c421b97240

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