Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6ca37bf1381784…

MALICIOUS

PDF

73.3 KB Created: 2021-08-28 16:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69fe5f0c5d35a3966890978572ebbb48 SHA-1: 4041b3e3df7bd6170d4fa584bdd5971c0ab0a23f SHA-256: ac6ca37bf1381784ebd030bf2e00c3a0e4c09d5d1d6149dbbb66fead4da0d8cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=how+to+study+physiology+in+1st+year+mbbs PDF link annotation
    • http://www.herbertvanderbrugghen.nl/draft/xonuvodud.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607497569ec98---68057233625.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/rajusevu.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/10256200282.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/6109960894.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175ac1b65f---kovuloremufebufivokifude.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/kabezib.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fawavifudetuzebuxujar.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/vebodexozelagatububata.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/18788720153.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9taaj2i9fa0in9ahkmgsnhrei1/36656495326.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd66c880e---61685773388.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/84101767651.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wipipinazoxidixidixabi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd977c83e6---salabumali.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160912942628f1---62031507849.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/mazewitaj.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jimerutobujoweg.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b1638ee7---lizexuloluvusapuj.pdfIn PDF document text
    • http://canadanur.com/resimler/files/wazezud.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/33356732979.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-29/20210729203537245708.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/juxagoxuput.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/55156097918.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_off0000bbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB1 16048 bytes
SHA-256: 137980f27c8655e0dbb0bfcb3eb2fccab7fb4eaf65ae55096b25c86c7cda4079
font_01_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 11324 bytes
SHA-256: bf67866dab6c0aecee490b520a5102e9ca2afb3a5c1c3c827cf6b607dcf4838a

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