Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1563b2352d0b597…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 21:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8499cdf4ee7f6f301917b0770af8ab74 SHA-1: 36ce46f7d95db628a649898d3f0a68fc23f5cadc SHA-256: c1563b2352d0b597a1d3e05a7f1b18f8b79f2cc0a3b8cd275e492692aec05036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alexandrapanayotou.com/web/images/static/file/49584220369.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d08645c93---siminavugososabalurawiti.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a09807a163d841f2a5e2945407765d7b/povozadomesafunuka.pdf
    • http://www.aluvascientific.com/UserFiles/file/rigix.pdf
    • http://visit-pune.com/userfiles/file/95420344688.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe8f5c24c---kigenolizumapotuwudijufe.pdf
    • https://batdongsandothanh.vn/luutru/files/divanubudodevajuneke.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd9d79f58---sinemumirarulolufonal.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd284e8906---lekasoruvemumorafu.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8e5d04d6a65536acca9916793d17190d/mewulozevuditewoxasuvi.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nnmdemtgsvufqcjcebkfasnmra/5865561603.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/291sus2b2gsnel7navfgpa8fe4/rerifiwobo.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/079b211e9fecb9b8bd9b4872505e1e1b/xiwopu.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5bkf9avmt1ne7pcn5cqq19mi57/22414430251.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888295f0d24---kamupegonegakefe.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8409704---76093343545.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rtsi5ltgoos9esfd6eirsgkrj2/dezup.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/77bcf5e562eb00694c4c8247b73d290d/66696279774.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a98482ff90310daa98db06fdded986a1/44839640024.pdf
    • http://www.hgbehringer.de/img/files/files/15982907637.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/58ccc61bfd39c7db51fb7afc3cac9161/potufikoso.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a44fa86fe---72712674671.pdf
    • http://bezagsecurity.cz/userfiles/84824132057.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4161efd9ea322f1a30846c2b1945b79d/73368576982.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089813a9a787---61234195937.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=apple+after+lunch
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16792 bytes
font_01_sfnt_off000109fc.bin
18e3189b6096dd8f527a7cf589763fe88d2bf4c80e25ebe60d78d54265219caa
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 17784 bytes
font_02_sfnt_off000138e8.bin
54913b19e23ca041871708ecb473c95a4b13f18c0ff4c8d01e76fbe742fbaca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 10280 bytes