Malicious PDF — malware analysis report

Static analysis result for SHA-256 21abfe1e403b455a…

MALICIOUS

PDF

100.9 KB Created: 2021-09-16 03:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1df3a9ebec518101e2e8f9b99db07a4f SHA-1: 34c284481580493645ebdcfd6079bea455a7737c SHA-256: 21abfe1e403b455a854cb4b22f6a168b36e11286ac07c4e46d7d34e9231bba05
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised websites. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

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://petala.gr/userfiles/file/lozaxudapowurumi.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t8o2fpg6u6tu44a91vijdbi2ft/99483630752.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/rilemejosurunonevodomu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ee994643dd08dcb90b50068df9adf66c/zifevazut.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/nupuganibipisikawoti.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135664b32920---bamesudowisubazasikimego.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404cbf39afd---84156621298.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60478639636.pdfIn PDF document text
    • https://schmitz.cz/res/file/68072594691.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/wutobadudivumisulebane.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bkcdj8g1ch1194c0pjohnaisl1/makumoluzojomafe.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/juwebumakarudezok.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/82192013298.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/donamumoja.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/nutelapikulag.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/83328808396.pdfIn PDF document text
    • http://fnathservices.com/upload/file/vunoxerowidiraguwi.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/nupofujovegife.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/7817649340.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sumogeraruz.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/76245983767.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613959134b978---bomidigedila.pdfIn PDF document text
    • http://nscenter.cn/upload/files/fozazikuwufepopekiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425ef8501d3---2919506603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=friends+reunion+full+streamPDF 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_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 10592 bytes
SHA-256: bf5503d3aca2a074b26069d5281c151add6ca78d35a174c5ee0e0fb1c1394f59
font_02_sfnt_off0001553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553D 18612 bytes
SHA-256: 6bdb3fcb741469c0e933f6abfb8c52f02b2f0ae5a6501c202dafdb8bdf98c9ca

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