Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc26651b0ccc93a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 22:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a1ef046036fa5f13e9ffde3d965c0c69 SHA-1: 38c409167a6c48016f99fa75955771feeb42ff92 SHA-256: dfc26651b0ccc93a098b4e177457bd7beb0efde3aae86823efe929f0dce27f3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bhk-aindling.com/userfiles/files/goteg.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d072nnasip8cbdc4t7f84epu13/dekomiperi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2915f6af55---12379962724.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/700726bfcfdcaa48dba264f9b95a6a4a/widugiwebixivi.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/61178143355.pdfIn PDF document text
    • https://andhimazhai.com/images/files/buwivalitiwukeb.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/rixegofaduwubafenuwumu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eda8ef510---84801771805.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57d4ddff---88812464011.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/44691784103.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524010306304519.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/66243200702.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05f8a654d0---4974304934.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/gopadulinobafu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e3b4d6a1ebb91e19d8beedadd28f5e33/zepefux.pdfIn PDF document text
    • https://12shio4.com/contents/files/26294071825.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/wagimonavegi.pdfIn PDF document text
    • http://standardamulet.com/files/files/37588321757.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rupiletenilibugefumadoko.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/meluwamowezafit.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29450982142.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/25458956878.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081abc8be165---57510525113.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8bd229d9b---74040289133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=edelweiss+tokio+life+wealth+ultima+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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 10820 bytes
SHA-256: 845e7f990d5ac74b9d4573717158c1e9b662780c4d10b3eea76ef21b77a05a84
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16736 bytes
SHA-256: 5c7ea5cde68889bd832973c19e3f8aff0c43537f40b677a1f55af789e5760b33
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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