Malicious PDF — malware analysis report

Static analysis result for SHA-256 9997112e78f6fac3…

MALICIOUS

PDF

85.3 KB Created: 2021-07-22 18:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e0c10a403435fd40de1a5718c5e98fa SHA-1: 133a60a8fdd1fd61a2497628162219a081539f09 SHA-256: 9997112e78f6fac395ea3e8b955e2ffd535ef0aede5f71113d631973f4498caf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these URLs point to compromised WordPress upload directories, suggesting a potential distribution point for malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://ipsgroupjjn.org/userfiles/file/duxinebikufewel.pdf
    • http://clairerolo.com/userfiles/file/rimuwamikixotopewa.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073bd576e---ziwebeweji.pdf
    • http://instandee.com/Images_upload/files/dupibi.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cad089d08---84817661298.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/82316823863.pdf
    • http://bkdesign.ee/userfiles/file/82748268499.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9767593538f8da75068e9f2e8c484960/jawaviranakogidugekimawa.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bb1g7t0vbdf29e6vk6chhvmvq7/jalogaboxesewijo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a7079d616---29501246146.pdf
    • https://tepihtrava.rs//files/luribiduvaderuv.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/52709128913.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2556625892.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62047cbe6927b73254056f1de676dc2a/85860038145.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c875c51---54386564564.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51008a7039de39cbcb9f6c0644941fe2/kobejevopinarisitugutok.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/9676107078.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f1e01c22---99043970707.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/92ca41e564087976ad7330d13dc08358/72842106524.pdf
    • http://artospace.com/pics/file/91714255480.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7d63334e---10185809467.pdf
    • http://banquat.com/userfiles/files/gekonofuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=talk+to+you+vs+talk+with+you
    • 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_off0000eaec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16792 bytes
font_01_sfnt_off00010303.bin
d205e8502aa9ffad2f08ec4d3a2217f510dbba93ba69fc7db28d5ca1ad7878b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 10288 bytes
font_02_sfnt_off00011a69.bin
9a4fb3e042ab0ed3d292789561b463d2a0b5368c97d41ed1d010c65f737e7ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 16952 bytes