Malicious PDF — malware analysis report

Static analysis result for SHA-256 615411c6a287f76a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 11:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86c4f35fe2acfd18e248272f00eeaf1a SHA-1: a78fc53787273eda2b3ff6e879588271d3faa525 SHA-256: 615411c6a287f76affe0f18c707b8ca5e313b044d831b0d811ec64afd2d6cea4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to other PDFs hosted on compromised or disposable domains. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://foodexgida.com/uploads/files/tapivo.pdf In PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/fufemovuxinojutebob.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/49n1b4cadnn4u8s4m56tcscf21/82816547861.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899b1766c---miwufejuxezikogu.pdfIn PDF document text
    • https://dukupahit.com/contents/files/saworevixamenarawimosamax.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/venuzix.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zifetedejewilukifikotora.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210910183804717570.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/4321035674.pdfIn PDF document text
    • http://sbairs.com/datas/files/63873929923.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/47795581692.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6c1aba81---bijivenuzinuji.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/logaxodobobiz.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/60996874487.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/wufeketizujasigusugo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lideloregipobobiv.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lasatofutalufeduwug.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363138d1de5---gerefife.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/64248449503.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/9348136925.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fisalawarugube.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561ae6ef2a---81894153371.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zipawozisasiwomejutegez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=act+science+practice+test+pdfPDF 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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 10428 bytes
SHA-256: 0dbb4acf63ba6c6dd4aa5dee57c328b0c5f8b70ff63c47ca12ee61c093ffb067
font_02_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 17932 bytes
SHA-256: cf0c0e142c44707d15d66296f97ff133e053eac55f5cbdf2834a83c3a4c114ff

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