Malicious PDF — malware analysis report

Static analysis result for SHA-256 e722cbc36ccbebb2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b036848304ea63b6bb81bd1bd16c819e SHA-1: 9a4074e2c54b1f7c61fa6e4367efbfb71d4c77fa SHA-256: e722cbc36ccbebb25ffe37da9f5bf667fed51308445c4a247632897715232c00
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by numerous heuristics identifying the PDF as a link farm. These links point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phish users. The document body was unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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://chcial.ru/uplcv?utm_term=wide+grip+cable+row PDF link annotation
    • https://preprodpcb.com/userfiles/files/12677585864.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/laxipumidevurudep.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210707_B6E9941239B2C75C.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210729163810-fetoriretofejaxapokam.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ac10bee260ae1f1c21d6fca68366306a/65469923104.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/72aa226e2d7304a959f42abc9bb779af/67016587473.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/33898302258.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210824_104650.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pidajilovinekuv.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/figusagopelete.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8lbu05kn57q51kghtvdmjel0f/kagexifureziwinobakavuze.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/72077448422.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/fojotolexofobow.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/28451315635.pdfPDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fc040a01f06da80094639341d8bca600/repot.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/sefizisonenixamuwabo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/82124702853.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xonegarijunuliwapo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/57d3e8416ad1492241daaa67b91844cd/ragopu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6546700e39---fomesazep.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zotimonikazikufejiwupe.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/cdf73d537ad39c8b085031dd92e3b487/26490981496.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/savalavizijetibegabuxija.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/50306767732.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dawuginil.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10536 bytes
SHA-256: 153df35f29d7461f47e49c1228aab3bb946066e806b36c811e37e45179d801ac
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 17196 bytes
SHA-256: 3bd971ab6080d02681ce2a455777fed18f0fc42dab5ef2fea910a93ebbe0a85d
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1