Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fd5e1ad48371b2…

MALICIOUS

PDF

84.9 KB Created: 2021-07-29 19:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edf838254a2847124e78c7d7c330cf2a SHA-1: 9149565dbe4391eec3cf45ab4afc18bbfaac367b SHA-256: 99fd5e1ad48371b24466574c3c12c99fd4899411f48a91c244882dd8d852be72
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS uploads, indicating it's part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b58f65ad9---83901948860.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0p2bl541l4jbp5p9eieccdospo/7198544669.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a882f184---16118429136.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/016dde44395586ddc596c57d4b848c06/puwasupin.pdf
    • https://masihpt2.com/contents//files/sobekexakolarowet.pdf
    • http://elfuklid.cz/foto/Image/file/72016863503.pdf
    • http://jjmcp.jp/userfiles/Image/file/29386884006.pdf
    • http://gloucesterclassof81.com/clients/23558/File/77619443474.pdf
    • https://kipass.fr/userfiles/file/tebamemot.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/46076402147.pdf
    • http://briquettemachinery.com/d/files/fawomejavopogibuw.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a61e2f75d---juvevezoror.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/13468b6b6079c7c40bd592aadccbd314/razirovebude.pdf
    • https://hsse.cl/files/56564698266.pdf
    • http://topoint.cc/userfiles/fckFile/20210618083219.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/92394562373.pdf
    • https://eyetracking.pl/userfiles/file/45532621965.pdf
    • https://commonlawhouse.in/userfiles/file/nipisakuwozifurumiluz.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e12dce9e9---62218900829.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c8n9pfnjd2hc5dvd7vt79150u4/sujipazumopukunefekon.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qq8p49a6l6tbs06tjio0lr62tt/69619608124.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ne5mogn3h1gk4938a5fbloe89o/piganubiruvapigadavomi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+engine+pubg+mobile+gameloop
    • 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_off0000e9b5.bin
4600dd57b32abf8f2cb99624c5d425ec1a80a1ba84efb61ce5b17fd1e0c84df5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16676 bytes
font_01_sfnt_off00011511.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 16792 bytes
font_02_sfnt_off00012d28.bin
ef62291a74038288b7fda6e77774e6637a3a81061bdd993fa61c035d366d2138
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 10704 bytes