Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04ed7daee5449e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 05:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77dacab63e197f8d37ac9a5c237f2a64 SHA-1: f7024cd59ed231fbabfee2f577281547136ea518 SHA-256: 5f04ed7daee5449e9a77193d05090697329b4fa676323a11e1efb17dc9b49a9f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure and the presence of multiple links to WordPress upload directories further support its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cebe4f5c61b63e60b404d54de7ceeb5b/64193490859.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/82097503392.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xazovuxom.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/vibajijaxobulaxotagop.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/fofajolekijasebonema.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/30906829778.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/39458987557.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/fekaduxanadavazidodujuke.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bavufiniket.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/338b686b6a7a8a0900ee8f8a91b576e2/74672233971.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/44469494768.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091119051099050.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/292986808cc168cf6c6108b622df3072/sadawet.pdfIn PDF document text
    • http://newo.ru/files/files/fukawuwojuzaraxos.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/15010723080.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/tivok.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/gazijut.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/lusefubijaripofam.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tonevagatozepesavunatezos.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/3109768215.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/8160919160.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/ratopunorozatezojubi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1c67f4d3701ae4b4e743180c776691c6/87184123404.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zitulimemowanoso.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/23074272301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+improve+wifi+speed+on+mobilePDF 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 10780 bytes
SHA-256: 6299dbd4f127630068b54fc5ae330ae4b9bd8d4803cf5ad8fb50aae8a38dbede
font_02_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 15504 bytes
SHA-256: ddeecbd2f5fa2e45d47a5d1be31e0dce0c42ba42255d86728534e47dcf22054c