Malicious PDF — malware analysis report

Static analysis result for SHA-256 824e195b646345c4…

MALICIOUS

PDF

91.8 KB Created: 2021-07-26 17:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 929abf2baf05bde46d1656e38f9e4293 SHA-1: 418c2469e67a8db67ff5f8f179feefc06bf2db9f SHA-256: 824e195b646345c403923b582f5a473c5c91e27db4b1c7a03f908a59098a3893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to potentially compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of these links indicates a likely attack pattern involving social engineering to lure users into clicking on malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/23da38eb1ff5c8a7a134d0fa70183af0/dotowurin.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e6a78cf990b8b37c54c72bb65fa01caa/nerinetevod.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aqq9hjag1ovnma2b2q1p7ssuu7/60371074920.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dd6a3a1c0---14070069579.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774cfbaf92e---vuvewetulakojosudafo.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/uia05jmgra9c71m4949ocgf105/76624315462.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/1861203335.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d513f0446c---98296022867.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sajazufizatusamo.pdf
    • http://bensonlandscape.com/editorData/file/58456184713.pdf
    • http://asesorgubernamental.com/images/file/muxovulomirevuxusu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2992eb07---memosonaroximimot.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160799d4c96f72---vekukekositatowalavozo.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/sajixukututiterelemopewip.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/wefelolutukis.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ejcd0753s1jbk7c22b5p45mtl0/67137727252.pdf
    • http://ttc-investco.com/img/files/8413943956.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbc7862972---70261807644.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f586c13---lelut.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089be0341944---naporikajotajaxeji.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849226d11a7---3420416127.pdf
    • https://mebelihome.ru/upload_picture/50581673705.pdf
    • http://epoxidice.ro/mm/file/5895179467.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec86a94d4---nomofelojabiful.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/48459924807.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+20+coin+generator+no+human+verification+or+survey
    • 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_off0000fd15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
font_01_sfnt_off00011527.bin
10154e000b75cfc0f2f7ede2d08e26ae11498f86d84262549a9569d0519899a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 18336 bytes
font_02_sfnt_off000144a6.bin
c84bad437e2ec4207f64d66ec3f5930f9eb1d9fac93d24472a970d2f8d2b086b
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 11236 bytes