Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cb5a5bb86ababe…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 02:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6719dab9e60a17eb68cce244f551dbba SHA-1: 0ff6a488ac26f9406e3530d578e7117fbeb3557d SHA-256: d1cb5a5bb86ababebed7913f58cd7e213fd42e62a915fc55e12b803c51ca865d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and instructs the user to enable content, a common lure for malicious documents. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript and numerous external URLs suggest the document is designed to download and execute a second-stage payload, likely for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ide+para+desenvolvimento+android PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/10f709db44ad446ff07e961766cb0b7e/66274114832.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/simogas.pdfIn PDF document text
    • http://only-svet.ru/upload/files/96393244965.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/genanu.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/bebopetibeb.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/70252087945.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/bixebotilajosesusiriluma.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/blitdin571qdne74hnc671qmc2/gagofilagofonufixaja.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bilixowira.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/96594783648.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/dejasu.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/sibolelorubitu.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/2169599272.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/geworuduxalakuwilak.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/77246391860.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7a0e2fbc3b2c085c4d0109e54c9d6b30/93694611923.pdfIn PDF document text
    • https://cncunse.com/d/files/38225964084.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/zajere.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/69761424512.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904073845.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gavika.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/88769954277.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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 19444 bytes
SHA-256: afc197c08b97cf14e7e0acf2cd3de4521ba1103f60a2c96be65f0c1a4fadb305
font_01_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 10572 bytes
SHA-256: 2aaaea32ff8a26e0c52c24731625ded17154b505e1ffc26084d947b03df031dc
font_02_sfnt_off00013b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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