Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5789eb2799793…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 03:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e44716d24dba61d36481ebeb1dc66533 SHA-1: 75a2f2a03cf7f601ee96324243ae4b8a6e2d3b1c SHA-256: 88f5789eb279979363acae268ec1e851b79ccab422aa2e98a2f30fe2e17b44f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious content, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=android+ringtone+per+contact PDF link annotation
    • http://soupworld.de/upload/file/24971525164.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/15842214794.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/29181672964.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kelenabi.pdfIn PDF document text
    • https://sim2007.com/files/regalikutawurakalideza.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/noxuwawiwutidexatafo.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/6757629256.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pugozimiki.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ta50ml36esvjtaunoa8mn24p2p/51654017640.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/68222943579.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e533b3d932---jufekalirudititesepivun.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/92533704048.pdfIn PDF document text
    • https://ijp2.com/contents/files/78582695079.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c59c4aedb8829c7f9ba1894e3f7628eb/feruronomulegi.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/55808344544.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wanesolaganimotovom.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161411d645e924---ligemimefo.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/25035002602.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/82396926583.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/kiwokaj.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/zanowujuvupopulilavogi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614115524423b---kegokakidudeg.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/benegapiwitizoba.pdfIn PDF document text
    • http://3q1p.com/upload/file/210902172639590395ohl3hjbgp7gr.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wovuxutoninojikaraf.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_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 17356 bytes
SHA-256: fbeb2390569e53059747a7c1b2c45194185fb02698230f2e809e6d91c17eb457
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 10456 bytes
SHA-256: c25339ebe088876d7811e1189e6232283634875564ca9d5393425467e65953b9

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