Malicious PDF — malware analysis report

Static analysis result for SHA-256 91057ead81696428…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 01:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 431a9de034e67db5db17850adbb19939 SHA-1: d48794d7f982fe8cf4f049b0b6f299a95d0ffb03 SHA-256: 91057ead81696428413c53cfe1b8ceec4ba2c7ba24842358adc91c8094fb18b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document appears to be a link farm designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://armanetti.com/images/15655724882.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c25b0b34---sukuvatugalemikafa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7488e384d---78738474819.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4d917b37cdb1f7053ef2eaf9a86e23e3/bilomemadapotaxusixim.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0091f42e6f5c4e6540b1f4a5ed047efc/sudibaven.pdfIn PDF document text
    • https://network-italia.it/file/42077177252.pdfIn PDF document text
    • https://everestart.com/images/stories/file/naxenotetijovuguwabomi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e58ce8c212d7422e761ff98f9943b0e/91461739936.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/et3egiqved35teijgiglidckg2/36031670284.pdfIn PDF document text
    • http://sgpeo.pl/users//file/risifodunerebemutozu.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/34993431020.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e20606011---62805041385.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/17953246177.pdfIn PDF document text
    • http://fygl.net/uploads/file/020010455506.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834961e8f78---30327521587.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnob0hf3a394fi7p2hft5mosq1/91955035062.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/gabanewegebajebesonel.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/64336935068.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk3fracldaotlt91m5jf6furmh/wetuwululumarozubano.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dowotanabagevipinuxapu.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/kewerufipifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=quotient+in+simplest+formPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 17584 bytes
SHA-256: d71ba3f63b97efb98075f8dea5f21e702c953ded863e256501572160afec2b05
font_01_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 10516 bytes
SHA-256: 29a8aa0400ba373ffba71d20774e7ad2f1bdfcac93be8b9614744d853b09b8a6
font_02_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_03_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 1672 bytes
SHA-256: f8eb00b08a595825b67b563f0d79adf91575ffb12d1d7512fae67364a065685e
font_04_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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