Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68dba81c5c422c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 10:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ce0c9bc9caad5a94c83ec33bba3edfc SHA-1: f26d3fc9c57880b3490ab2ecd06eb7ab3bd181fd SHA-256: 9b68dba81c5c422c99a0fc3ce54d614edc8acc15f9175d2a8f9437db2bbf0d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs pointing to various domains, some of which are hosted on compromised WordPress sites or appear to be part of a link farm. These URLs likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=3+axis+graph+online PDF link annotation
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/37409919371.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewesumovobifogefat.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/29004520921.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/jatupatezusakijijidiwila.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tefasivafob.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/13999311762.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fumagofowemeji.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78b16a27f---relatemobomiwakevuxin.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ab921702ac72dc8ad7b2cb819e77ef4f/jafukazaluwijetizaxalizi.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/3134461462.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/13541458746.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bupotapasinuledolemalise.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/ligafetut.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/58955360483.pdfIn PDF document text
    • https://chptravel.ir/data/file/tuvejozuwe.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141808662db6---43426654209.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/83498027478.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210906225656.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qqfd5gsaj9hihiagb761pedk17/28913880065.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/61307880569.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/fafeminaxeti.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/89439787588.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/toves.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_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 10608 bytes
SHA-256: f0abbb6929afbe02c0ee0c7ac154d53d6ebbc48d9aa3e65f93f33324250d1bd6
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 15416 bytes
SHA-256: 28e2ca2bf632526f5cf0bf3bc44961b274236dbbe45d6c8cb5bc9e8ecf28fe75
font_02_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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