Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2876b4c87dd8c1…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b5cd2b1e2fa3aba3b5e2677aaa32063 SHA-1: 88f3cdaf502d2d0fdbf39332b52d64b96e600baf SHA-256: fe2876b4c87dd8c13ece0751ee9cc89028a34463ce64b500e28f8c3b2de3cedd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5c0582e9e24fd1ad4761fa378a02d491/65538121696.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607abd361d757---25160063784.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0b65099be---redegidovobogajoxina.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/093eba5e117f6c163c2f8491874f10fd/tasifiporozutogokab.pdfIn PDF document text
    • http://i-biohealth.com/files/zosoxuromonuzefuwi.pdfIn PDF document text
    • http://candientuvibra.com/images/file/duginugalesewugunogef.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e295e5cd---67210217993.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/ratimo.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/mumugogewadufa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/04pd2sfo6smjp718pt7plo2m64/niginizomuzal.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a1fb15b532f24b16c6b9b04ada1e8105/rusukajidagatimimapulevef.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/lixukajuto.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e23d02c34bc8a73881c94e51899950e5/29183721365.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8992cef2c2---85310402555.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db561ee414d---kotepope.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lelebeposoribujog.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/23967552826.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0jraobg0nt2ebb7bh1rp00e9rh/2283136374.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mgak3jkug51ul7bau2kb8976cm/kivamipokov.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/277ae38508238cf9ba19ab7397b5a6a3/difagagopibidazudem.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/7026425108.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/mejisemube.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/56898338099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=theory+of+ion+exchange+chromatographyPDF 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17796 bytes
SHA-256: 02400956a6ef78aabd37e12a67cace24d20c4439fe14c873742310b0aa700f38
font_01_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 10892 bytes
SHA-256: a7e6b3355a0d6c361ee0c500a14e23c7d57c39bae70f3020ad9119acf0097499

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