Malicious PDF — malware analysis report

Static analysis result for SHA-256 839b42914727309d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 17:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcbf94541408f6018f9cdab1450373f0 SHA-1: 6c01e3cea9e9dffb9d78cc6ebefd2609dfc9a561 SHA-256: 839b42914727309d8e4317dca500595bda0f7db36deb06979a7fc1f9c39f4fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the document structure and embedded URLs point towards a malicious document designed to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=vb.net+select+excel+worksheet+by+name PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d639f147219---57233324273.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/573b158247adda33e02d3b787be88f03/patedopomonubudateb.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8drmlb17st2j9t74cl7qif1c54/78957860957.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/nedazufawimebiweko.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210613062621.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6806814b89---gizekadinofetazogox.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/timelodenujuvavo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/814263b046bc8480ca3ac8ad63f434cd/38631815079.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bfa7f1cf0a6fbf64fd8aaddcb2e5fa33/lewipave.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/jemek.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca494626d4---51169288363.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u09art0872q308een7kf27otla/81900546492.pdfIn PDF document text
    • https://netpage.info/userfiles/file/tetofokaneguja.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/gemilavidorawogavalapipe.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/61d334b29c1b9b0435f97590c7826cea/44850617277.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/dapezifiragegebuge.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b32b8e6f14---99699075624.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/23971804727.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e42c47c2443---giwufu.pdfIn PDF document text
    • http://digifast.cz/userfiles/xegarabomorumepotusofepul.pdfIn PDF document text
    • http://riph.pl/userfiles/file/pusutujovivalobo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/98b6136311a1a1f2cb63ca54224ef330/wukipixapexeti.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/manobe.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16904 bytes
SHA-256: f26fb68b18cc450bd3ce728c4869ebc28edde4b96f43d91f67e07ed6aec97df3
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10972 bytes
SHA-256: 54679a127d14881cfb9b059eb9a82695fc1b51818f313a5e86eaada4769e2935
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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