Malicious PDF — malware analysis report

Static analysis result for SHA-256 a444e67b2ec00d47…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 07:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 003f214fb5241d79e6d4aef9ac52d0f0 SHA-1: f6ce62ca257739d9a26f69270c59b9bc5995fe03 SHA-256: a444e67b2ec00d47b7b75cd7450dddd05e0941bcd712f5ad3ecbabcd6a9e2d1c
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. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=cost+of+living+in+jaipur PDF link annotation
    • https://laptoptranganh.com/data/dulieu/files/domijuj.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f4aa2fbb3---kipale.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/befepetonamiloneg.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fbcf13a0a---dezarajure.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/88111215901.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/34256255255.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/29719437971.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/85435592277.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8d9a0f6c9233ec507e6da55b406e4a15/51138155847.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/bikejixaxidosagoxol.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8fba9183b28fa506c2003c6ae2ce0239/mezetezer.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/nipibi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908ee6c0555---vezomilejomumevupano.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jibevesofunibakowobigik.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0894b17a---78687106103.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/tikakazux.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/38023610099.pdfIn PDF document text
    • http://raczcsalad.hu/files/45112798149.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed06ba0bb2---somulajanuma.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5ede092b---17260693914.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k4gd8h65vf5sfqdjt20bvq2m1j/71459644141.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c1944f846---bapivijojogimizodugi.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/fikajifanuzunituwog.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/gabulidito.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8ffc4ef533f91f91ec5f045b22f478b0/suwiwuwuxibegerezad.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_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 17820 bytes
SHA-256: 1ae0819bb34d5972ced0bffb428af6f28c62fa7df378912f617516142a3a596c
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10728 bytes
SHA-256: 3c8c963365d9e1aa9a0bb7854bdbc7e628034ad1310d176d1a0a9acad9d1a154
font_02_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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