Malicious PDF — malware analysis report

Static analysis result for SHA-256 e331748c9029260e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 11:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fb6ee9914044275800c91fcb00b4bf8 SHA-1: fef3aee32d0fd3c011dff0c8f90531fbea7d554f SHA-256: e331748c9029260ef019e6ecb7fe9deefca4ba14ae2dce6f712a9e9a1e5dc5f4
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 upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The file's structure and URL distribution align with a link farm designed for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/btqpno7d2srk3tuslb5jmpu4ut/zidovipumizi.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/zunumorisokasote.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9853c0911006aa4cc2c76f43aff5041b/20899442592.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210813183155.pdfIn PDF document text
    • http://weingut-suppan.at/files/27728736483.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/50042616205.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/diziferevizufubixijame.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1478d94e37---xonovividopipufixiwuzelam.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098422f3607b---80147611813.pdfIn PDF document text
    • https://digireg.nz/upload/26280331644.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3da50958d9d3e733b2b8f11972b98989/timegunujofokiwot.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/03rdboav06sfvv335pm879q9vg/68356984522.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/vinowukuzejap.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9f5f9abcc3a2f869e6995d96c37f714b/64828853365.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f7f6d863---xaxupidavimomepefurufo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05151c9c27---fitabinimujo.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/litamo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/nagokozixaxexa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/9901838818.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/26185111281.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c2fa8ca305b8ce56821c4b1973211729/ripefixululi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/avesudunofoneka.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb528dbb95---sifofiwi.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kilapinogivipiwovupok.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108301811513303.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/ponaxamuroroxojizimux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=venture+in+meaningPDF link annotation
    • 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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16340 bytes
SHA-256: 8d14e81511313864d6293374dff01856dcb77510d0101b81160c81502699fc75
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 10188 bytes
SHA-256: 994db273f572d87383bc692abdf24f8b997eba71bb18b42ed6bb8127908bd269

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