Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fdf30f7c90641d…

MALICIOUS

PDF

80.3 KB Created: 2021-08-25 14:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1bd04fad401c7dfb2a42587ef503c9ec SHA-1: 82313349a7cecb80b4ca9345ac2b9d9e2940ca46 SHA-256: d6fdf30f7c90641debfdaae88339a530fbd2075c49e6f12aae4eb8d8f6eef31f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607844983d731---rodulunapuzerizijos.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a4082res55koof37ab8gmjq2lr/15649905441.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/toniti.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/suvozesijagimuki.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c61dohadn3s3534lvv0p2ruo0j/mafese.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd985f4e73b---ropizuporejinitifubi.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/67550354368.pdfIn PDF document text
    • http://learningkey.org/userfiles/samesafaguxamivulitosenol.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c198c995f5b99ec1e345f94fc6a4fde8/20413620624.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/20173093723.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/retos.pdfIn PDF document text
    • http://dhf-china.com/d/files/94105139524.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zevaridupinuxugizatiz.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/27793321272.pdfIn PDF document text
    • http://russia-ex.com/nafotovelewu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/72308705006.pdfIn PDF document text
    • http://bienbao.net/uploads/files/zakubikuligoramoz.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/malujuwowamirovokeke.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a8173dd0c743e1f86cadc09539fb60de/13077702668.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8a5c5d44---zasoxonefetogafefariwag.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3967b53012---xodetewobesudotikojeji.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/negepalitetezavotebanemi.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///senibus.pdfIn PDF document text
    • https://codecs.roimages/file/ronilur.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7lm1ua88kmuhdi2ukbf79pvab4/tazewesime.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/9148488246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=class+7+science+chapter+11+pdfPDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16212 bytes
SHA-256: 5b3ff5eb3a18bc748c1572efffc90bfd41a2a6705390cbd6531fee0698636ab7
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10732 bytes
SHA-256: f3e602bf273cb6e31cb5c0f6a972de0768c2a64aa37b9c233f7910a9bfc6f208