Malicious PDF — malware analysis report

Static analysis result for SHA-256 09878a60e72d25c2…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 01:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a2272c4f622aaf359095597e4af81d4a SHA-1: 55b1fc690d5afa17c81bfe439f48aacadc74e2af SHA-256: 09878a60e72d25c2aadeb82508f5a7a4ed82d8998c83fb6db31fbef662d41ee8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards a common pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b80b7479---norelekada.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99ab1e7b8---17108976382.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4ig8fevelg05h3kd3j5t1mknh0/56621743326.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tesegopavebopil.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2b9a77b2---kuzapemefuravekomagufiwev.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bd24e12e---ruwugixisivosakesidu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/47973f4985460d7ab4adaccd0f917f8f/918625637.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/14546392337.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68285c6e4---wupugunejarexerovofok.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zafuvadizuweluwabokarori.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9bsq78bn40sgdr9f8078stgkf7/xukepekotuwamujalozubiju.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///larozenugaga.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/59g9eiu0igukhr6a8bacrg55gg/votinekupujuzanif.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4a27bb72e0c35a85cfebdc57db1e00e3/xalofodupovoxilenilajuzuv.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/29932824239.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/nevar.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/vutamegada.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/v11m1hqgoqem62knckro01anta/dimaxezirel.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/48a85052e73b8e0ab2881b339a25aede/kuwevevumatutarirupafuzu.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/76153782260.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fee934f90---xutapun.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/20388934119.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af902b69668---83633845272.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877649e7e---3307813069.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070805264743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=annunciation+of+the+blessed+virgin+mary+churchPDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 17348 bytes
SHA-256: 5768923116a15fb326049bc6b09fb3a5fcd1a93a636e4c97f03e1bfd1dbb1c2c
font_01_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 11324 bytes
SHA-256: a62e9b15138854a8a1eea6db9712d6d1eede9577b3fedaeb9fc2b2ef60ae1a19
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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