Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d03e0cc7a8b715…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 20:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cdfa40d4a0bd0a5d06ec16182eece75 SHA-1: b8386a260c67dc8586a4d34a8dc67cb023fce440 SHA-256: 91d03e0cc7a8b7158b53d46ccefbf59dbfa55bf378d0b08d3e45ebeffcde72bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://vgcanada.com/userfiles/file/bazifekepujexiki.pdf In PDF document text
    • http://m-styleauto.com/js/upload/files/68275420904.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c7nvdjmmnsq599mu5jnvdjaskf/ziluvabexesivijawosefi.pdfIn PDF document text
    • http://standardamulet.com/files/files/rawevimaxosigozaruxub.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sovonirepixujapetib.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/ramiwolafunewu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/8157782903.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/ledabivadelexoxixav.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/vadelasunolifis.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/rujodew.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82985629717.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/vidofuxujavisudif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hppo6i5aduqfnadi2ti1fs72d7/42397084141.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210905_B085640C25510157.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/diger.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/46061117127.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tojutejitaxiwewaro.pdfIn PDF document text
    • https://partnermind.cz/images/files/wewogofusiwekowegi.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wepokutusudugeluxaroxobiw.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121013548170.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132160fb7284---vefitegedigavutalokunos.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/17382268509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jak+odinstalowa%C4%87+aplikacje+w+androidziePDF 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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 18952 bytes
SHA-256: cb4c8cccf032eb3b5e7ac19606fed60a5205b1f7621c062980cf07f42f8f046c
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 11004 bytes
SHA-256: 63aaf5cce3842d959bfa3d4a6d1921062a534ab27e62a45d396a5b19416c8357
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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