Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ac8ecdffff242c…

MALICIOUS

PDF

99.1 KB Created: 2021-07-13 05:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd0d2d706216edf7ec3fab70722019d5 SHA-1: 31c8241f6eca56dfeecfd3173af7c5b0bc96f4e9 SHA-256: f5ac8ecdffff242c35ff577a4f068670f0ec63acf68783d14b2ad69e12f05549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, many of which host further PDF files. This behavior is indicative of a phishing or malware distribution campaign, likely initiated via spearphishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/18abce3d31c48f96b6a6e05e3fa75f40/vapavobizufu.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/vevuwajak.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/89880815231.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/konixuwawiwibe.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/8264831824.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b25c8b0714b25491f527660c531c2118/radix.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8062f10d---nukarovu.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/26885957847.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/19e916036b826b27df1950e2eadab2ca/rukaxoravogikujifiladigu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/310818911.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/63636598286.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zigebebewosikugitidewidi.pdfIn PDF document text
    • http://terminsk.by/pics/files/74194914095.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6eac9384632ed33166c3aefc69e970c5/dibaxexufovarob.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85704dbcf---zagukeg.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a8f24026---16930736981.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/90199434697.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/kekatiguxosumu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/varanewexezuf.pdfIn PDF document text
    • https://abeess.com/userfiles/file/nekutituvazorug.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75d0bb112---memiraxenogupilozigaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=financial+comparison+between+two+companiesPDF 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_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10736 bytes
SHA-256: fad286164d054f5a347436220664daa9b97dab87d6ba09e240bb2764640429ce
font_01_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 17388 bytes
SHA-256: e15032cd86e56a6b595a3b85077de1ff6e7165d2d573bd90eceeb56f6127ef8e
font_02_sfnt_off00016522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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