Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27d66019dd84ee0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50a02393cbc0f16bca048e3fd45c74f8 SHA-1: e5382f812dd4f69ace35a2b771387c1b15223d5c SHA-256: d27d66019dd84ee0c661d259108e93dfd84d9b845229c611bfc73a77a1ead9fe
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=granny+girdle+porn PDF link annotation
    • http://rintoyo.com/userfiles/file/65827870591.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/37065113188.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/72637166712.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jttrrpegl68e1s1hnghc6880h0/wodorulemufagatoliz.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/77159490312.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec3e45ee2---nujijusapasamebim.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/sowoxugasalibuxe.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/56875626236.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fibunijabefivem.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fa464f48---79707264545.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/divifojoxurodarewi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vadotaresibukovaloribuxip.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/87190408435.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/puwawobedurifiba.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///bebere.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/lugowaxumi.pdfIn PDF document text
    • http://elskenecologie.nl/files/pasadutesiguwo.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/40899489566.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/fumusozezamon.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/vetuver.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jupoxi.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/wedolivefowotefetumu.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/lefuratiperivox.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae57b7a62---tekidukakoloxikidafonozun.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/90934684239.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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 14840 bytes
SHA-256: 4df18d7a7025019d7f3eee6b1bc78ddb2f909dec7e5fd15e427b62636b50c92c
font_02_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10456 bytes
SHA-256: d9f6b291279051009ea104336b765bbc91c9bfd2e521107ae0797ff15b4a96ab

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