Malicious PDF — malware analysis report

Static analysis result for SHA-256 0107a5efaca73503…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 02:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f3eb672e695082f9cf90c3b35a43017a SHA-1: 1eb19f47dff875e08dc58fa6275026727f3501d1 SHA-256: 0107a5efaca73503b4ff76fac228a69f35720dd3f9a644a8993dc1cda39378f8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://jahanchart.ir/data/files/file/96883391714.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4c16aa6ef5c1bf0b51560fcde4e8284e/74036391185.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/93526527084.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/rezitulapaxup.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/5030406972.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/45208281737.pdfIn PDF document text
    • http://bronia.org/userfiles/file/88597726588.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6106a5513---motigo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bagetemovak.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/sudorizunurodonejisu.pdfIn PDF document text
    • http://holtfamilyreunion.com/clients/5/51/517903a0238f10651a3d170edcbd2d86/File/ramidimur.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/33487602987.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/52687368223.pdfIn PDF document text
    • https://melz-feu.ru/upload/96708443144.pdfIn PDF document text
    • http://agrion.org/upload/fichier/7507279648.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/14617691408.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zawovunesovaze.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086aea3e2a00---figosebasuxifajuze.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/vutifatopiso.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/14uoi36htngs3396v8v18vckn7/75681044498.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/80781763329.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/98546233629.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1713989714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=www.homeschoolmath.net%2Fworksheets+measuring+units+worksheet+answer+keyPDF 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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 11164 bytes
SHA-256: 7e3d3d7bbf356a25eb788d721b8c122eb097196520faa65c85e060b657596fac
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16524 bytes
SHA-256: 8a06cd72fa3a056895d7baa52d2d0b9ccabec343a15c8acba665ba3fc938fb39
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1