Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be91476f0e644c5…

MALICIOUS

PDF

97.8 KB Created: 2021-08-14 19:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd2f48a605fbce39af132ade97a3776c SHA-1: 60cfe27079a0739714ed87a67f533b0805aa7211 SHA-256: 1be91476f0e644c5ef0a1cdbc1ae2dac3bb9f6527b60dc3e45fb387f82e68280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://biosite.ru/images/news/file/72233874389.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a542e15b71---jurupopupapaf.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/36894231282.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f7828a541e5---pajizi.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/jipakewemobiwefevizebogib.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/rusuk.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/rolubajiwawako.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ktfbnopk5580nea2ifpiub754u/23174434525.pdfIn PDF document text
    • https://afayl.com/userfiles/file/69283625656.pdfIn PDF document text
    • https://nexusmediation.nl/files/fajiba.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/3273947282.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/28u1orkt7r6q86frkceg09i1r6/11064460808.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e5e37ed3---kazezalelo.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/gixine.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/11577388699.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/56808554052.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e66c653c---95635422554.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079436d51dd9---gogemarefetukadujebo.pdfIn PDF document text
    • https://wagaskar.com/media/76047137234.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3ba99955365ba773ad336c8a44760e9f/dupobarozefulofewef.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3abbb125---zaropizarawisete.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6698d731dc489ae874b12a63caab3ee5/pagisatawizedol.pdfIn PDF document text
    • http://vbs.pl/dat//file/limirimem.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/vebotekuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=why+does+my+dog+run+under+the+bedPDF 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_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 17892 bytes
SHA-256: 9380c4fd92c9aaaa5233ba330c25625ff3b7a30a25b9e783c67dc3dba07e9fd7
font_01_sfnt_off000148f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F8 10744 bytes
SHA-256: c1605ad477204e32e45902619e43a6d456d438054b7ec86f30019beb0262083c
font_02_sfnt_off0001614f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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