Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6511b891bfbfbd9…

MALICIOUS

PDF

180.3 KB Created: 2021-08-20 22:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ce7aee05e70ea8a760da7404cef3575 SHA-1: 16499a9d971bbbf7dc6aa8923d4fc9e0b8d57079 SHA-256: c6511b891bfbfbd9702be81e81dbcec259d70b5bf8625cf7d3a7a0f2ed1dab4a
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some of which host PDF files. The presence of urgency language further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9473

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2254ddbe4---66674288717.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/40822178657.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1c55c385---kituripopezemubafum.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/53405409061.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/16bf2fea73510b83e567cd5a3dc08437/taduji.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/riketokijonegebezemet.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/3647533130.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u1pk7lhivtc3qfefqqjt9lmavr/27308541198.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/gebemarenasokizafuvenajet.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/dodunevizefugexivogatu.pdfIn PDF document text
    • http://cloverdiamond.com/file/muvapodekigoguvevupo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f804c74055---diwarok.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/96746831519.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/puvumajakipenagedunukeruw.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/fisomubatirozijafapasetu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f533934ca4---sufapiwifelolaboxa.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1783cfbbe11b383372ca8080bd931800/69736680746.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed91e5356---noxiwawuwonamut.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ee52821b1158f6cea3807ce251fa5ee2/netokepufotamevukav.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/wokakovamejafuge.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5682ddb2fa11b258c2120412d0272e3b/lafusoxuxuketonapuvi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086801b726f8---xorukafem.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/11605270144.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/84472846908.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090f040beb44---lolalifotiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apple+music+family+plan+cost+sri+lankaPDF 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_off000258af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258AF 10928 bytes
SHA-256: 933c8c64594ca10f2c8a1af932550d9fa998957d940c4151a0453908ee4b578b
font_01_sfnt_off00027216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A28 20700 bytes
SHA-256: 8d4ce46d196924b81255219c7cfc9328cd7853177d1d583f77c5a6a2b67b0c17