Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9d3f7777be6e49…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 23:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d536ad112e955128eab42b70fdbc4b0c SHA-1: 9952184bdda598e96964c420ae568bd2a0094ed4 SHA-256: 7e9d3f7777be6e49e27c63c32d968a615b70626b01b4330361b1ea1892481e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF structure itself is heavily obfuscated, and the document body is unreadable, suggesting it's designed to host links rather than display content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ibrahimkoc.com/images/Media/files/wunofomevirofa.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5837b7cddd07e86e9eb3b8d74c0974a7/33540907206.pdfIn PDF document text
    • https://music-group-store.com/upload/files/juboxamoxenumogudobowuf.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/20611913532.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pusogeduni.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/kuxobepub.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133757d97205---daregivevina.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/12703398235.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/furogumoj.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/bunod.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091802033573499.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/64e312af1aad22da8b826dc90e9e0fd8/27240165890.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/57938688222.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614279b6631e9---43028985180.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/64cd086445c209b7a04b805f20747cf0/liseguxotorufesaxuduk.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/65590793599.pdfIn PDF document text
    • https://krossi.ru/images/content/files/76407439985.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/70285650612.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/jarazimurovopoxonopex.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/32725808584.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66133750541.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338003749c5---4359243021.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/lebirelojabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rpg+offline+apk+modPDF 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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 10612 bytes
SHA-256: dbe12d13a953ce01acf92ae911b07b846f1383afe792c2a863feffd8d95dc0da
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 18244 bytes
SHA-256: da2f10c56bacc7bf1558c53b497c2ade5db260e8d31b869354fad1dcc18f4fa2

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