Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f825a5bd5bef99…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 09:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf6247486080f12163e2fef3cb2d39f3 SHA-1: 31238c8aeed8c0ec5f157ff16667dc6bbbd1b438 SHA-256: 33f825a5bd5bef99514abc73b75a1bf80bee21bf75c8d2c4210bf459f932342a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+to+transfer+app+from+phone+memory+to+sd+card PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d504bae3c5---datexuweka.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/77156382770.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/19962210991.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d9350655324da58835ce89316028c74c/zegedetog.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/55256548888.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/jewitosizox.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/24098322374.pdfIn PDF document text
    • http://letdentalab.com/img/files/50207820911.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/59748558929.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/21690595802.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/luzowipiwa.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/18629970430.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/13214645886.pdfIn PDF document text
    • http://edallyshop.com/upload/files/50746961056.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/94924401824.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/61364458347.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/ketalasusadunidofoziwisiw.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/zukobunabumarix.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/53935925328.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916035934_7ipink.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/tagimujagonikejizezixejum.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/moxonumobijafa.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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10940 bytes
SHA-256: ed62ed96a799231d78a1411e5509a237459dcf93a914c9174fbcc88b011413a0
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17932 bytes
SHA-256: fd60dea77dda920e5e14b964f595496d91adebc7b547ffbda0a5aea7de467e96
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1