Malicious PDF — malware analysis report

Static analysis result for SHA-256 df03330b71b300da…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 18:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62a0f6a8a128c9669eda49b50b2fcd4d SHA-1: 1bce1db51765f6228f5a482c68570d7d1a001bb5 SHA-256: df03330b71b300da8cec665a3c1365819e6dbdc8f7380bf12f4a9072d5f7d369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to distribute malicious content or phish credentials through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--49s538bo8ux8c.net/userfiles/file/sazojubimedunudenomuzifa.pdf In PDF document text
    • https://raiporjai.com/piceditor/file/42811074219.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sesibodekuwiwoxobapowape.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111f065cbd36---1547483970.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0e19898ec7035319b4304f42c8bb5305/jawewewumaw.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/27872873220.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/genute.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609290137cbd9---10041399202.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/73405489435.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/debenazejixo.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/tevuwigis.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/jobuwa.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/setadejajikug.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f65c1527aa357d68a9d4e570effa13bd/53406190883.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/zewokux.pdfIn PDF document text
    • https://telenovella-bg.com/files/toselolupijada.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9c7343556af0ee71a6d78ffdd9a215b4/55317960504.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/383nps0d7m5umug6ho6hg1i1s2/kefolonugikasatuwizuvi.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/39686406804.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jipit.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jajakutadanorufigusobabu.pdfIn PDF document text
    • http://altinay-law.com/images/file/66610531290.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/6656571297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=posing+techniques+for+location+portrait+photography+pdfPDF 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_off0000b610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 11260 bytes
SHA-256: 896f69250fac7d052a90f33264cbdd1f26fc9efc8c774fd987821611e24a58a9
font_02_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 15204 bytes
SHA-256: ddce795d99d533324010db916b25db3fb00f66de8d01bcc40f86416289986ee2

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