Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca113c13250b043…

MALICIOUS

PDF

74.8 KB Created: 2021-08-28 21:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9098dd2f97651e9db759eee5b1ba84bf SHA-1: efb92c5a6aeb238f1fbac0e629b167546ec3aa50 SHA-256: 2ca113c13250b043957238c6cf3abbf5a67cea708d5f30cc1dd268c79173e1a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious or phishing content, a common tactic for initial compromise.

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c32c1e29---mijoxumutoxijikaginitapu.pdf In PDF document text
    • https://xanbiente.de/userfiles/file/tojinalijokuwogodewodo.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/xepoki.pdfIn PDF document text
    • https://paperland.bg/uploads/file/13315867844.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e66365aa957bdfc99469fe29e2627804/2275773578.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f77c6c7d7---viganijak.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/rubaxuvanizizirere.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fimituwafezuz.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dalovesoganudigixituboti.pdfIn PDF document text
    • http://sswjeans.com/files/meginupukinobukixori.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/86131865461.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ejrbt7cpba9tsp1glau3jsdgvk/fujupefufebarusenema.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/75121928410.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a7d3dd10---bixele.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/76223645262.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/63474323322.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/besuxim.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/romikux.pdfIn PDF document text
    • http://kme-kme.cz/files/file/gasovanovoxuvabakufesa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80030658137.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/opk2k9pk93fej5niu56p9lgqu6/3858929993.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/fejegilexasu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c6e55fdf---66404693362.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1e8b055e---17279781788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=eddie+leonard%27s+carry+outPDF 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_off0000bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8D 10592 bytes
SHA-256: 64ac00715b9595f80667687511f73312e7adba88bd5e8b919e8c145f0e912f4d
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16912 bytes
SHA-256: 68d8bf054902ee665ef85191c311c42a9b5bf6661da45ce6e83c3a51d95b44af
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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