Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caf317c3b6a35f0…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 18:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ee290a102643422010e5f3a7ce6d744 SHA-1: a84ab5bb676b60d2cd492c74a71539c5918a6b92 SHA-256: 0caf317c3b6a35f05db0224d7ebc4a2d492c2532e658a0ccdccfe87752d32e32
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://elitstroycraft.ru/source/file/lomemovupuxi.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611254da9158a---34744370623.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210730_F1F202E9749F596A.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/80714780930.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/dorupegosepilofudiw.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/94858194600.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/31c135ba130746ed8f1a395776abe1e0/5385004254.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/04356d161cd4edde213979ed41887aa8/xapojasufotogovuni.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/76099601922.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/xazuvowalozeriganovu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076269563aa3---genapavikunisivoneden.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/71929444069.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf0d7ad6840f8088da7a18818814726b/xopavim.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611439b106071---dutobifopetofokibazupinel.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0446acd91c---fivajajesikawu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/vudepaxafekuwapovi.pdfPDF link annotation
    • http://tokyoracing.hu/userfiles/file/6092587184.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea65c426b31322d42198d3e9955b02ae/40200747682.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608153b8d14dc---86113905181.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/webikofomaxivorozenodutow.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tefatoludakuloturag.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8d9242d40158d79755eba8056e5e81f5/xusid.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d1da48bcd23b89e0b71d9a4460526a79/33324076554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=surah+al+waqiah+terjemahan+pdfPDF 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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 22216 bytes
SHA-256: 1c4d435ba5aaa0feb495424bbd131688991675e40cdd30d927deba0205a39c0d
font_01_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 11012 bytes
SHA-256: 264fbd28a0e176fdd8938fd97b95b52a35569c0a1eaa9887de5222fba8a5192a