Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73418f905113d6c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 19:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58f8b01a34d4869bde5abe0c57f571f4 SHA-1: dca36e3386141007fb1a4905f21690f1a5563e99 SHA-256: e73418f905113d6c4f0c15ec27008cc9b5f33f705fd8138953cbb29486ba336f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=phenylephrine+and+blood+pressure PDF link annotation
    • http://birzebbugastpetersfc.com/files/file/kigobixivaku.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/88896549909.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/ligij.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/26290375395.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b069a4be577---71605974636.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zovami.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096729216976---87034256195.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/91cd0cfe507e056570e974cfbbac7683/32787960895.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48b9566e0---2810506458.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zejigawebe.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd234319---moworoninel.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfdd20198---86793478685.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2f48b3698---73301593590.pdfIn PDF document text
    • https://defi128.com/userfiles/files/62927676132.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hmeos18d870kaev4i6li37dc5o/vusizaw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc70ea6ef---mepefemojivowatobosogulak.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/67184457550.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080502054994833.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33e3dc04b---sovesaxevikom.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/rikakidonamerel.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/65406826576.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/js0afc7k1nistl8knm3rv37h82/83200245738.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/60145771594.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 17288 bytes
SHA-256: 11c47e1f1b0d0d5328602ab7f45b106f189de92732d981aee00032c097843a5f
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 10744 bytes
SHA-256: 0cf755343e287df581f7d2202131d5a73c9f44411bcd6ba47d3e0659401a4bd9

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