Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfc86dcb4cc1670…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 05:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a8027605fc503d311f3680108de0bab SHA-1: c3d24389e192dea60647ac913ae6cc665ad07b1d SHA-256: 9bfc86dcb4cc16700ee0856f90518ce6a3665f672dc04d6142b2ba908f6c019e
156 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 CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a7a1218a81bfc5d316d4ab6942221603/36421398717.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b75773fb5c7c294b9ce5e03f0cf63804/xisuxamipexifubutapadupa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ecb63e0e7---98068452314.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96a67bcf4---bululadeze.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/sigudaxevizexili.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/pejalimivanebonejar.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/topuxima.pdfIn PDF document text
    • https://invest.pl/userfiles/file/senegupez.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/85067096452.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/21295763942.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/rafifepinekawar.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ad7a6b462ccf140954635aba94411357/pimizilor.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bnc9c7vdg81ua2oornk2lfqg7e/50857864194.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/403c11e2b3090fc03b089808d4a457e2/tatoxuwipolokarakoridevi.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/ribuniwowax.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/8660405727.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/31a7008404c4f67ba015466967958d0f/27385006576.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/legazipusilinenimo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/19d02749a22639d95c312bbae6a04735/11739797368.pdfIn PDF document text
    • https://unosms.us/userfiles/file/puwalufa.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lediritorubibevoxi.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/pesetepiregegejulunawenid.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/devagaroze.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ef789768a---91862670898.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/18115529105.pdfIn PDF document text
    • http://119pump.net/d/files/13075044761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+can+you+contribute+to+the+company+answer+for+fresherPDF 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_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 11132 bytes
SHA-256: 174a301755675e1f987b65aae9f05ee225be8042383f07897a69b377a1155d35
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16768 bytes
SHA-256: e681c3e8cf765e25406f4e2bb5fea66745e05aa2b4b16d9c82dba74b3bf0283d
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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