Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ff5e00e1c1b04…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 07:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2a58ca2f37b2559ae20bb78ea8f3225 SHA-1: 4a31105ff656db46716ec6cb341b97dbfb92f83e SHA-256: 0b8ff5e00e1c1b041fabc101410da27d6b3bfb2a15fcd68bf27233e2f002ff05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing lures or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=english+phrasal+verbs+in+use+advanced+pdf+download PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/nukimekegukukagozajap.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/40765a253d03322750d71e45294c801a/xokejalisiti.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/17162571297.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a481f80a094---ludijilafazovunolot.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6f5945a14cf1d697f5f748305a16f51b/26456462445.pdfIn PDF document text
    • http://recrute.fr/files/files/21155809176.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/i4bprmn4nnmg0dgmgccg918lk1/91884494115.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/leruserigaluluxevid.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d5dd636874aa2b50ea811523088835c5/36654963272.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/36255112711.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/83054579483.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/28448935722.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/17702393775.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66577552208.pdfIn PDF document text
    • http://mobilenmr.com/files/files/12430710231.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607d849766923---lopuvijudutamenowijananu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65886391369.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b024deb3e733a9ba3be6e67150a250ad/wixugazigulifowevu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc45341b4---73189983803.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcb8315eb---bavetotozukarexeja.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/15348164591.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09df215dbe---9326237240.pdfIn PDF document text
    • http://hasyo.net/files/file/28362693626.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/11333315769.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080416fd1495---nafaxituwunuzime.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_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 11176 bytes
SHA-256: 7ebd82c835a2cbee557c1e3acc0ef12805cb948401f61b5f5fb096a7b15905ac
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 17528 bytes
SHA-256: 47433160f6b0d9565a3bb335d3336bd20d1691a508ed1ba6be676e680574ba39

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