Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e83f579feec8410…

MALICIOUS

PDF

94.7 KB Created: 2021-07-01 14:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01c8ab4a2de86069d1761dc932d251c4 SHA-1: 6eb889fc9f1a91f3bc9a2704ce529004a256639b SHA-256: 5e83f579feec8410d57f6180b20dfeebe609c240e14c012fada7d5c4d39e05e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160744b71a111f---tunuwaveberakaxunav.pdf
    • http://aexpress.lv/index/images/up/file/kibag.pdf
    • http://garmagostaran.com/Upload/file/derinitimokirok.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b3212d02e4638e8af9121b3a7edf6be9/4676879214.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086829b47e0f---vodimikepategebod.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c0bc0dc498ddd2cf47a0b5a69261e08c/dotezurilejekesazawuwuk.pdf
    • https://cambodiadriverservice.com/userfiles/file/vaxosexex.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/53314961401.pdf
    • http://www.gabrielamaciel.net/images/content/file/gejazomewadobugox.pdf
    • https://szaktel.hu/uploads/file/tebajavexugusomejesufowi.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/xupadogofe.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608399a159b8a---72745739167.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eb0d02a09545da7782e3f8add481056a/1420287653.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a22935eb7---57938965655.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f05ae61691461441d4dad54af1f32fde/68227272376.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/635c563a33a9964d0bd408171daf2700/42992304215.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085327100039---vinumabokujedena.pdf
    • https://lescourailleurs.com/upload/editor/file/bifikozije.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/11cf04afd7c6a5450e21fd61811c4570/64842677708.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/a07d32tnn4kf6mts9d7kfab0qp/mesepoxelatokapigalalupo.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lnboib4j6bcveu5vprrj48n56b/xipize.pdf
    • https://internationalmedia.com/userfiles/file/kakuvabupavosesufug.pdf
    • https://papiratisk.cz/soubory/vujelakezaxapa.pdf
    • http://canadanur.com/resimler/files/ruderanafexosafevofawuka.pdf
    • http://www.ecvbrass.ch/user/web/file/96969924579.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=harry+potter+and+the+deathly+hallows+audiobook+download
    • 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_off00010d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 16792 bytes
font_01_sfnt_off0001255e.bin
74e16dd138455af99379b7494b534fe5542b402d54fdec9ed9d5adfb733e39ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 11012 bytes
font_02_sfnt_off00013eae.bin
bf5e5dcbd54c500f13ebd31d4d2410151c9b50ef03febc9f2ae09b4a1c7796ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 17820 bytes