Malicious PDF — malware analysis report

Static analysis result for SHA-256 db44ca934e051b1b…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 14:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6e197b55d368779030dd02a5842f4be7 SHA-1: 61771b2fed622d3be4199ee3d7ad1a5736c6b304 SHA-256: db44ca934e051b1be6b088e8f14b6d67832d9f8af5a527957220b3996a575632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these are likely used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=how+old+is+a+female+dog+when+she+gets+her+first+period PDF link annotation
    • https://hkfew.org.hk/ckfinder/userfiles/files/jipokidumojukizopupub.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5dc78bcbcf50ebcd242aa90b675a5c20/lofegiraxarezolerebo.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/gevitug.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/janavefarupatuzivar.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/61881517821.pdfIn PDF document text
    • http://checopharma.com/upload/files/bowixowopewamividumu.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/48842627817.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/97376914044.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/raxusawefax.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2e7ac7e9c713c6568bd1ad768ecfa909/92862989249.pdfIn PDF document text
    • http://llux.vn/uploads/files/72168494429.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/98852032246.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/dowiluwanab.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nimawamijinevogofanar.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/foroxipiwajedusalalaw.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/92608709592.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gosefikesuxaf.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/wubazisusira.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/buzatafuwobalawufefoxogo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b93398808---2208271436.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541b003a121---34625993301.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/27159577754.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4df56ca6662590620fc1d2bbab321f8c/13978225846.pdfIn PDF document text
    • 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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 16880 bytes
SHA-256: f259e4d6112398395e9fda4115dae8b25380dcd346efe96380c8f1e3b6ccde16
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 11020 bytes
SHA-256: a113a7c8c639b7dc821d1f85b25daeb80ffb150ee49fad2011624f5213f5f89f