Malicious PDF — malware analysis report

Static analysis result for SHA-256 638145eba6557023…

MALICIOUS

PDF

79.1 KB Created: 2021-06-27 15:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11159057a7575a25d0a82d4a38caafe6 SHA-1: b27a9ac69c5770243efe81bf9dbb26db716d77eb SHA-256: 638145eba6557023999e9a1e9307f3322dfa3fe0377353eac5ff0ac053b9225e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160862130bf08b---suzejupefelijuwi.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5hudlhco17evvc77jqstcuci55/54476235850.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d823d3340---galipobumuv.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a224938b12d---jodamawazirajorudazuko.pdf
    • http://kibbkw.com/uploads/file/96415062980.pdf
    • http://bkdesign.ee/userfiles/file/26664012876.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7dca7c8c9f4c81d597b4fff106a1b6b7/77394249919.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5658da54d---17587194951.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1109cad4b6---zitofijin.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2493cec13---nifew.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8b78952c---92781942646.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02a291dc5---gobipesuxenibezit.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/lazeliziz.pdf
    • http://pphjako.pl/userfiles/file/26818822080.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e21ae3cd6e1059cec109b54b4c32daab/69564388109.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecc1775ee---96566715089.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2ef04a4947b23a1b8a8e0e4589233690/vafaluxibegomagemore.pdf
    • http://kawoka.com/userfiles/file/85620009843.pdf
    • http://anhbanglaw.com/userfiles/file/lonofonutaraxova.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785f684e9a---nofofibabaredeved.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c92feb92a---foruroxub.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f13c031e1ac303351cc4f74cf4c351cb/bajafivo.pdf
    • http://driver-jazda.pl/upload/file/86404424315.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nutrition+through+the+life+cycle+pdf+free+download
    • http://janyska.home.pl/_mjanyska2013/fotki/file/wivepoxamom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf76.bin
1a55d36fb9f3bf2a9d4cee531e5533c8ce5047a976c6c4fab5526e407df0d264
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 11008 bytes
font_01_sfnt_off0000e8d8.bin
7d04f828e962a4a893eb78653381fc48ae59a993aa05ee8e83dce69384f5cd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 17372 bytes
font_02_sfnt_off000116e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes