Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d359c5f5e207be…

MALICIOUS

PDF

104.9 KB Created: 2021-07-01 11:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e3ae75b9788a4be973b2a0aa40dbe02 SHA-1: 8be78d126e05e515070fb33107529b04fcc83977 SHA-256: e6d359c5f5e207bed233f9ef98dc79b5889e33971c90427ddaadf0b1f66218ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://amitadevnani.com/userfiles/file/febagalat.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a026cb433c1---sotapizopejuwubexaxevib.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/48320600490.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b3f5602c---wakufiwojuxajudoromufe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/limigidora.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d65cd5bd3---lopuviba.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/befoxodowipisokug.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a80bac13eac73fe36ecd51dfa8c714c0/47534587150.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609053d3c4e8b---18378263838.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d987ee47b21bf094c498a8d1f1445ea5/fofonovabarafekenuxu.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210626_ce73d.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666247d768---biwujuketovoliweviwez.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jeluvebegaziniwug.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162542b732---forakapuloliwiwikopen.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077586f8f67e---10729545997.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/samutezutidenowaxukedazal.pdfIn PDF document text
    • http://citranco.com/users/files/97941685512.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607937d999e47---befodimunexo.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/dopumomaterowovuzirog.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b110bd0af27---gidevixonejedavuv.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/dudegifebojezenavun.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96bb2b0212---toweralamelapenaso.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/xobiselar.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607aa3bf98447---36829760749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hitchhiker%27s+guide+to+the+galaxy+1981PDF 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_off00013360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13360 17412 bytes
SHA-256: 9b018f846d5c3a8263102bebadcf9839d2f1763049a243117c908a1bfe5772f3
font_01_sfnt_off00016145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16145 11404 bytes
SHA-256: 01810446d300822fa4bc06775e3440db511cadee267760331d4c4b9e676dd315
font_02_sfnt_off00017c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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