Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ff1832c9aa27f9…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 044243c6b11d75067a03bb1abdc1632c SHA-1: 2b77f149faaeea89a5c360b5dfb78636ee223d5e SHA-256: f5ff1832c9aa27f9e02722a96071e739849e9ecde9f6ac72cd264bad0271bb23
156 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics as a malicious PDF, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites, suggesting it is used as part of a phishing campaign or to distribute further malware. The presence of PDF link farm heuristics indicates an attempt to leverage SEO or disposable hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/m4dd8l2hp6e5vgjskjvb9tc1c3/81989173906.pdf
    • https://kartplast.com/resimler/files/65001289208.pdf
    • http://lawrence-spruill.com/clients/42275/File/44524040146.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcb7e8837---66196117094.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6075ee3747b2d41bb00f2ef9698d728c/wezerukemegafufogomupisi.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076adbc43626---22997684721.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad44e8ce5---vejimix.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc021e31f2---35008662220.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15d82483464539182313e377f0c8d37f/gexasixexa.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1459cd3f6f3c28783867846bcf74edce/45854103456.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/3b783dp0ffhpkih5v131v8sa7e/28921872329.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a4c5e11ed245060513af4abb8a7b5176/lumotetesepatiferaw.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7gdl9sd5bosnjqq4hge4ckov2/dikejegavatelexogatozeg.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081386f9d13c---vokukibisatuperupariri.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/afrejfmau42opogr03dhpmrn17/bowejitolazigimoladem.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/56344849458.pdf
    • http://falerisztika.hu/tmp/67157587952.pdf
    • http://atdawnwelift.com/userfiles/file/25649222675.pdf
    • http://wadirumshootingstars.com/userfiles/file///91505433281.pdf
    • https://designclarf.it/file/gemepufususofaworas.pdf
    • https://cordovajewelry.com/images/file/47335448742.pdf
    • https://addsfly.com/userfiles/file/4864767010.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/dowazimit.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3771ede57fe421d12010430fd949e85b/xepisirojuniwonigen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=new+employee+self+introduction+email
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75b.bin
cdeb8c86f877b7e484f07cfcdc2a814f3492ce2aa7a19f6b647ce3314d822701
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 17096 bytes
font_01_sfnt_off00012398.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 16792 bytes
font_02_sfnt_off00013baf.bin
9da608a6a833c1db1a75c9ad9ab9b2bc3df21d90a33eeda36470eab9e0e67f47
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAF 11060 bytes