Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c7cf4553715e24…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 12:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11419e1d0e194623c8061708917874d4 SHA-1: 1d3538d1db6401f785da6557fd4fa7d454b5b3f2 SHA-256: c9c7cf4553715e243085798b685c774af7161f9ff21b879a0409bc3124bfb0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, forming a link farm likely intended to redirect users to malicious content. The presence of these links suggests an attempt to lure victims into visiting potentially harmful sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=characteristics+of+fauvism PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8adc5a7ea---94506330331.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50299775061.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0561dbc050211e9712ca5b8ea7cecf3f/jopikumukuvibujo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/909b13b794bb050e043d135ed85b9445/sireburo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6698798937.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/64784897987.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2979068922---91682155009.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/25769277628.pdfIn PDF document text
    • https://bliznacite.com/files/pupizobivotenukimemujur.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/30577858280.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/9605121371.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/lemezojedidazajegejidar.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sesutezogerexegep.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/8376339636.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83590f560---tovumowavijugexadogu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4k0rk2s3s38kjinv8n02j1gn3/92662679112.pdfIn PDF document text
    • https://viettrungson.com/media//Files/ribaram.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086194fbcc37---16022072736.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d45589e567---11652453308.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a152e3b0cba---pebikizukokaxamaw.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5rq9njvt2272d94j3ufcgcc4u8/82933292694.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/24666389464.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/94d403e8a28d5b253ed0151aa882fa9f/90426033290.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/budigeleguromaka.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/18128871579.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_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 16136 bytes
SHA-256: 0260dcddf9359e2fc4c075568409bbeed706d0e6d3f34c256e3065d6cc44afc7
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10648 bytes
SHA-256: c6093b488638ac30da4406eb5ba9135dd1c8026aafc4d7dbad218a780e686aaf