Malicious PDF — malware analysis report

Static analysis result for SHA-256 e643219c7d4c4c77…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 06:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b71c837763976d874e11ded7b31e121 SHA-1: e028f476a20f403c24f59ee11bb7e0cc99506bcb SHA-256: e643219c7d4c4c770548b9ad193743b29f89aad80899bbdb1a347850b9158c37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm designed to direct users to potentially malicious content, with one URL pointing to a raw IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a common tactic of luring users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vincentianssjp.com/userfiles/file/82284782426.pdf In PDF document text
    • http://centonze-vini.com/userfiles/files/46059676362.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/36341973799.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/miburax.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/40707188829.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20061003159.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/13800485196.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34164675582.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/16320822517.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa3133d3bf---63782815148.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/79516326458.pdfIn PDF document text
    • http://salwex.hu/file/xidasoli.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/60kmt98muishmd0mrv0tasuei1/watek.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/70420175753.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/vidunurebamijotute.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/finotafepuveni.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/44675034852.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/36939016805.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/waboxetifepupapebov.pdfIn PDF document text
    • http://packturf.fr/files/zevamigafipumobadurixisin.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_151725.pdfPDF link annotation
    • http://indago-rovigo.it/userfiles/files/26322659300.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/jagivutowosejuzesopefalo.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/zokozogiwefijuvinuxe.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/89372137053.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5637d647---robetumaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+vpn+turbo+downloadPDF 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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 10496 bytes
SHA-256: 692ed3aee6d1140dbd7762cb7fa311c3726dd01d8f930fd4d1bb96126665aba9
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16444 bytes
SHA-256: cf783988a435dd993e307ade06f674521982784ed3f97cbb4be07fb88510b539

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