Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88f1c374ef26400…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 15:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa995ddcba0c8c5f5c530feca137a795 SHA-1: 7418d36f3e31de6ebbce865b57d48c849671f318 SHA-256: c88f1c374ef26400cf77a1a609bd5db0e6b315aa24381262fae033a4f3cf18ae
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains, likely to download a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=flower+anatomy+diagram+worksheet PDF link annotation
    • https://promenade-perpignan.com/userfiles/file/luloresorisozimogerad.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29f2831a0---53169479677.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zopovaxojatelafavuf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5d2988d1341027becf9b5cc2aa1aa9de/fowolemapesozopumo.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/68942043868.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/631144343b72570ade3d9b68d5cc5c52/rupetafirufewuganonunog.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/linojuwat.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/51878744846.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/10844388803.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lekuvofokuduwokijapa.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bebutuz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250548315149.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc895d463be---tasogubu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f39901e064e---vidonew.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/niradolo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161258b09a0d50---73827771273.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8c0b0da1ad91dff723240d8b1882b87e/pepopemututawipapex.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/26d84ece72d8597cc99f30116ddcf4d3/nunomizobefe.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbaa46549---boxosaposenutabapuwixezi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/km751c61a6seef1gjks1he71mh/9347681885.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/dekupufurawapufapefowolif.pdfIn PDF document text
    • http://meskerjager.nl/media/files/72188924077.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/44628336796.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_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 17264 bytes
SHA-256: 646f43b20d5a11ed0015c42782e81dc403d5bafbd6a6ffa549cbcb73cc0d05e4
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 10964 bytes
SHA-256: ff7a12a1a7f22441716bda504c615c09606d553a7f2e57623d186f72635ca710

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