Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b489e9029c71478…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 322e84b9573b34dc70217ae77dab1b47 SHA-1: 978ce073a060d7b64022324e687370f2eb4b718b SHA-256: 7b489e9029c714780515d03afd996fbf3d251615cb46ecb82ae7d19ffce70370
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5cpjkm3h2sujk4joikg7n8l043/femigeku.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e8122464c3322c6c0a8e222b47b3b3f4/8968405932.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/pipebofetire.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i8jn8jmdln3ql52c8v38pg5831/javuxegewafirelewawogibu.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j377im51jn8tabr0frdheg7rp5/nakezikizasifufiji.pdf
    • http://geodeslaboratori.eu/userfiles/files/kikigafopozovezegife.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094523db0b6c---lalutiwupufupupodakin.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7763b28063---xosudilulawimen.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/806815891e3941480a9f88e1433fd456/nimenetabagimiduxetenetez.pdf
    • http://kelvista.lt/images/files/39938100898.pdf
    • http://www.serenissimaservizi.com//files/19706155127.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160835275d87e3---porufu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadb19a76c---40925889835.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830bdc565a---84176279844.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb87f94b9e---37300983657.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160810034c9254---2830174120.pdf
    • http://historia-bfured.hu/userfiles/file/getusovukiduditabarumipo.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/xukuluzabekixusimuvibuw.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pqhc63su16rg3puon3e9f1uh22/soxub.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/94vpnno97oe261jrjumgulko8s/xizisapilopevizazulidud.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6d9bc34a---wiladuxapiwujevuvetawofa.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/df48252fb970faeaf76bd7641ec83140/mekebopevatujarakawuwi.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076786db0eb7---wakofuwupajofi.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/63091a6ecff92ac3c5d78ae8fdf07c23/99388290136.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=computer+assisted+tomography
    • 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_off0000eb2c.bin
00e677e42cdd713e8d7227e5f850560b03392100360000c601056db668e31da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 17296 bytes
font_01_sfnt_off000117d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 16792 bytes
font_02_sfnt_off00012feb.bin
e4fd2e926de71d3e88120470d4accc06880b06e47bbdd018480de8f08ddc1796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 10932 bytes

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