Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d0513113ca3f0…

MALICIOUS

PDF

89.1 KB Created: 2021-08-08 01:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 613c9ca563963b0b6349ade5bad8317e SHA-1: 54584092e958da6dcee3c76ab89619eebe209a82 SHA-256: 675d0513113ca3f00f613d6d573e3b5ebb8759c67eaefceeeb359aed9a5da37d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=adobe+reader+dc+patch+silent+install', are likely lures for downloading malware disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=adobe+reader+dc+patch+silent+install PDF link annotation
    • http://goodtraefarm.com/ckupload/files/dujip.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9hihtv32t7bghsgqjdvej22gd3/13660184325.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/miredavojevadoki.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/pijotumutunimimuva.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0ac72q9384hff3isr9npoa961l/87598518327.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52a942430---73922346478.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/zojavatotixarib.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b24268ec381---72508443790.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb24a83b49ab158c8a073f111923545c/bezakotoxazapatexosesola.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48698501804.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/64167730640.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/30834373489.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/40268546514.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/guwukinav.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/86fdeeru05vnh4pvslr07rhd8j/kukewizopelovut.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/detetowixolekezumesipof.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfd488c97---19208222113.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/97981922689.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/ca7bd17685d72bb9b4c4074837c1b790/jegolopalofos.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d216426a48676dc65e14d86e67c14a2/vujuxujiwe.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2s802j9bhf47bb6asqt8dapc91/lefosowasuniwidej.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160709c3fc2f3c---nupexupimejexu.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_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 10732 bytes
SHA-256: 92357d64c2d3d1feccf9c478cc6cc63e39a7ca39dc26845b8f8efa7fcbba5676
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 17696 bytes
SHA-256: fee28ac9cb2a9c2954d2e728b086c30647a3e7c7b3f29897035e6eb249b0b988

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