Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07cf32e02493a2a…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 15:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e88c2a3c20ba20f2f6860060adc021c3 SHA-1: 40f3c4a601f1b4a51f369f095c845d9d1d092b1c SHA-256: a07cf32e02493a2afa22efb72e700d50fb601f864db54114d8f3a8a3a88e13d4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these compromised hosts. The presence of multiple distinct hosts and the use of formcraft plugin uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf9c33c08b---tajududozekoj.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3937854c---vodoxeragiluxunalimozero.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/861d8d438beec061c4f2a0897496cb0c/potojutidegutoni.pdfIn PDF document text
    • https://chpcentre.com/files/file/jetumegudipuvuvarasipatig.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d873543ff0---vidupepaviwotopelobesosim.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/37811334891.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/126e92456db5b0ff8def90c0b1115043/pofedozonod.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/98592768613.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586748aad3---fufajizirakadafobu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081323dcf2f9---wiboxuzidurex.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c6a152c63576f2f35ce136c2cfdc9e11/liwenegemeti.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/79c759870b1b3601c16cfe5d78c708d6/9636033805.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0875391c---fumuposevanowidug.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/42247089015.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3aa5c199---gixivinilunegusa.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/to9vjv01svu25nupk2tqjptbg6/tabix.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/34e2f75b986a70e406a7df874bd973fb/navabugesedamaxerif.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210623_BD3CA563496B9793.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xurodav.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5123ad2ed3---jibuxupeso.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a950942ef34---dazuluwopow.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/2790531575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+game+of+thrones+crossoverPDF 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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10960 bytes
SHA-256: d35756ccbd1881fa00d04394f0bf5cba37868a75726873fe056802f5da20cdeb
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 17140 bytes
SHA-256: fae9f244efd1325f10e62fd03db6a83734645b9a6e0f38468467cd1e9858cc32
font_02_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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