Malicious PDF — malware analysis report

Static analysis result for SHA-256 801298a5fe1f1a51…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a355adf1d994e347990008391a559cc SHA-1: f609985c4bb911d1338a4ce2bdb18e679d2888ad SHA-256: 801298a5fe1f1a51929c8194ba53b39198d5ae589809db27dd3232ac6f621de6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS upload locations. This pattern suggests an attempt to distribute malicious content or phish users by leveraging a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mariamozharova.ru/uploads/files/95361803236.pdf In PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/87095132007.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/basajefufatugusobuxusejaf.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/dawogariniwir.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/1778209639.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/muwowumu.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/49015569008.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc917b7d---fagupuguxabowu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12162045463.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36813491140.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/puwisovukojugadanojagekab.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/84444501988.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/duxasojaresakilutemam.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/kibuvafurawolumegateva.pdfIn PDF document text
    • https://telenovella-bg.com/files/gezamemarumod.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/33649078448.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131211531031---lujeki.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nofuvuzawibuxefu.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/besojunebisipe.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109160858449072.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161332a4fc9f2b---46711388936.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/75292969126.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/73334532447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=samsung+j7+themes+apkPDF 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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10788 bytes
SHA-256: 6acd341356a9986a44e92ec043bc1045405f06dbf25fb40ee37c546bd7231113
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 17776 bytes
SHA-256: 09e5330485e0793eca2da40520018e3f76c645b5136c0e2ae5b974f47e1d5428
font_02_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1