Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73887912a5aaf5f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 13:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00d01d296e2421697e725fe0f274f825 SHA-1: 498b65eaa7da366a7b0f456e09039d3d3f4b5d1a SHA-256: a73887912a5aaf5fe499fce93a4ee64f775d13dcec37d90e8691e70bf3b08483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=1997+jaguar+xk8+workshop+manual+pdf PDF link annotation
    • http://tw-go.org/files/tojivowaxewaxapinosovu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/379a35ef550b69cad6db1021fdd83b15/74691078275.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/25531896175.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/97464123870.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93339509751.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/72206221802.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/98153543761.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5b65f83a5d3e6b9a88b3236a0f310/22330148354.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9ec9a6632---51730638400.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/femojubokiwi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/86663626875.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/letazodemidakasa.pdfIn PDF document text
    • http://ellev.fr/upload/files/diveritamalobipulujixedas.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db02646a4ad---lidegowitevimabe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/65a2df90347cb0cd4e81abb4179c6e6f/50185169012.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/63879620734.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/88715098897.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wikuvabutegorafenufuro.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1ced532c5---gotexemitejot.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdb529ddc0---pukexaxerara.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/254a58b84700884dca874413e87781b9/lofifaku.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/51872759987.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/99443046603.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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 11512 bytes
SHA-256: f28c805103cfa4d91ea3130003c19b5e4e7a4b1efcdcf4211325e71327c67182
font_02_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16256 bytes
SHA-256: e3d2b004a89559d5f97a943a5320dbdb0e873e79c65709607bf1b72b82bc1b75

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