Malicious PDF — malware analysis report

Static analysis result for SHA-256 7539af1e4c725f73…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 03:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 73f0232f3dc4dc5db88a23b754fd8758 SHA-1: 3464ff5d422017ed3551936250ac075f98a0067a SHA-256: 7539af1e4c725f73954306a9200f6c8290af696fc06d2aada7d5646d1f617afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lso-msm.com/userfiles/file/semamamuw.pdf In PDF document text
    • https://chptravel.ir/data/file/mefofuzebav.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614241ec4a0cb---dizuxajukikegodewavekifes.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/tijepipawiwir.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/35252947611.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/japufuvukamomedatumod.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366b4181c4b---7309540552.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/jifuluzo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/27064104109.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/bijiza.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acba9f1f1a---kapalatozepebidof.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/485121f19beb72c95afe696a2c7ae7b4/42921006791.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/togijosijikisitoxepu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/wepefesamizezikavofawuwu.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27875169688.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/buzenepategudiwox.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bobafimotijudisog.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/junidik.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161406b7f1e48a---28445479698.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/19906816567.pdfIn PDF document text
    • http://st03.it/userfiles/files/35050775290.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kudobodarasaxusepilip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ps+touch+windows+10PDF 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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 17312 bytes
SHA-256: 9f15a4702ff333f2a0ad6efbb3be49b99be0f78018eaf4e5b09974bbcdd9dc32
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 10388 bytes
SHA-256: 24dac7c5b1738f52c82458b1446964c4b58c4f4776fc0eb24bcf1b26907f8a0c

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