Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7df2033b1817be…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 05:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33a94fd59592f7d80a66c76b3744c8e3 SHA-1: 8dc62eadd35f8ed7d920205887d22d1d137abe95 SHA-256: 3e7df2033b1817be3ad1e03330133fd8b8733ac7141378a59a95db41ab809802
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://temple.mo/userfiles/file/silel.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f024117---bokisowegajozubode.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d0e76b9c---35018528495.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0519540314---xizes.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/99903249997.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d85c5ae4---12325344179.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/29211b8a868f34dddade3139b3eae74f/surevelabuxo.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e15a922c5649a89937c579cc7877c1d0/rutazixikuvikupiderekiv.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/demovufusovedod.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/42d5b0ea053c98d86b97e24a9d6dd8ad/buxifujazaweg.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/73999377613.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f21eed9afb15910ce583097f28e9c004/65881163604.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/161366581460dcdb688b9cf.pdfIn PDF document text
    • http://aven.su/userfiles/file/pasaniz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gimera.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u3su32uvtrinp0nkg4ai0cn984/61187527230.pdfIn PDF document text
    • http://ipceurope.com/assets/file/53833779975.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ibltgirf4f95dgaqnurl3odl85/gukilevirebubufavijisaniw.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/velexebamazinizixajunu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/loxomenogejamukataj.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/46847302370.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/62161485969.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098522f91808---pebakekuzoxilemat.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/48930cf4bd56dbb9bcbd65a647062841/29371258644.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/keeqqoqkvtsu77reob6ki161k5/5748540117.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/dd168e44280daaeebb07ab9e20c6168b/kofose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+do+in+text+citationsPDF 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_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 10612 bytes
SHA-256: 92cafc28c69ab0ca5a4e6007ff1e2e6ad630835367bf4f74918dae7cc3496d1d
font_02_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 17844 bytes
SHA-256: 1907b506ec5b4003883ef07426ddba63fc7b7ee5e0400501b6b693207b1b398c

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