Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4609ef0333ef3e4…

MALICIOUS

PDF

100.3 KB Created: 2021-09-03 07:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f1f4bc14222b1eafac9b6aada7ef840 SHA-1: 2b837c518da06dac0932d6f3a038ee3d34352ec1 SHA-256: c4609ef0333ef3e4a29ff3c2ed01707dc28906ef05badb58a12e370660586f9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://pistant.ru/uplcv?utm_term=affairs+cloud+september+2019+pdf PDF link annotation
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/543c1bc135d9b9cfd4ac867b5612683c/74782312467.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/76609523152.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/puwunulega.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/ganavumumipikasopadeda.pdfIn PDF document text
    • https://unosms.us/userfiles/file/kivemebajaxarekiromekije.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607113100d1a9---19754265698.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nujipemisev.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/92556340479.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lekanatavukutufevobi.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/bonozobovot.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb262f218---vagujiwevurofewa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/sufakisogujomopidifukeko.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qpj559ckfq13jsc5h23qrc3b19/pugufoguwilukipuzaf.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/99710771787.pdfIn PDF document text
    • http://splogservice.ru/content/file/75776479764.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/41331338077.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/kavumog.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160850f8b79d2e---talomopesem.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/71929820714.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a34842b11f7b310762f73634cd3267ec/95840405866.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/66352038814.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/midorul.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/3413019609.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607758b0c455b---vivunafexuvomesapan.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4cae68ce---73289779570.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_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 11360 bytes
SHA-256: b2b383e37e3b67a203974df3d3fcb43fe4f1bc52405a2c2c3a9a02138cc307b3
font_01_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15164 19068 bytes
SHA-256: 76baeeb99763e1e7f716d5aa7c8db8185f8d4029590f45182a18196baaf3028a

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