Malicious PDF — malware analysis report

Static analysis result for SHA-256 3522c13072126494…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 01:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c50287b736e0ac9fbcca4c879279de0 SHA-1: cdfe2a376fa345032cf9ed2e4c5cd7983de59397 SHA-256: 3522c13072126494cd2c6b54ea23b6c50f30b4f20edc0c8a8b6cd3fd16ae0dca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=i+want+to+be+submissive
    • http://studiofelician.com/userfiles/files/64621961459.pdf
    • https://artasedanasingaraja.com/uploadfck/file/xibojuxajexo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c3f2c439---negiduzuvodum.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3fd237ec---61364827127.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a43c6b5d---70358027755.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d118111627b2c3f6cf3d8f4c7859e7fa/verupulofite.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833d0c2ba---87945472409.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4263ad3cb7db0e8e3ff6bce5eef2e9a4/60849970413.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ec6b6b4659204235f2109d47c7c8fc99/nukidatata.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453eda66d9---39979953367.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/95637195282.pdf
    • https://faresaldabbous.com/uploads/files/pubewegiral.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0b3020108012b1cc930ceba32eb0108/dupakurejagotevofagexa.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9tcmjvfkhtll17hbofdrfte2m4/32858464927.pdf
    • http://shinex-auto.com/userfiles/file/jofosubasukel.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a1tb5lrptdq1upcoj28mp8lna0/wupidujotinidofinuw.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adce25062---1872489131.pdf
    • http://musicpark-live.de/userfiles/file/95041140967.pdf
    • https://fishboat.hr/files/vepuriwevi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c7ea1c21---suragadexefapubovakinu.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0df2f795cb---93538896400.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa35896b2---29432102412.pdf
    • http://didula.com/img/file/25871370791.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77e0b1dcb8b5f893aa2d7e54f797e703/8607958446.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c3406f6c7---64513279558.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin
c0826bdedb66b5a3450909a0102068e0779e16af03fa6e5d48e4637128f11be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 16816 bytes
font_01_sfnt_off00011776.bin
28407b80d78a917d58e04ccfb71e7213e3523d3db7c2c165ba63d767cd5e5941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 10464 bytes
font_02_sfnt_off00012f48.bin
b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 1948 bytes
font_03_sfnt_off0001384b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 16792 bytes

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