Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7874f6140ec0dc4…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 47af0e3dd4250e07e773e4796ae78086 SHA-1: 9e584b7d6dafffbdab326e5f11619b1be3cb80de SHA-256: b7874f6140ec0dc4d9359b9729de8ca50ccab03b9ac340121bf50e2b1fb38715
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aucoindeshalles.fr/menu/file/miterazejit.pdf In PDF document text
    • http://woorymart.com/userData/board/file/1857767666.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rivusujavopuseloluzof.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607565914b721---tuwise.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3d04e85a---9031307232.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2887d4858---96357043209.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06419d65d---pomajip.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/68296e9e2867771bad3456c7a4cc52ed/zumisuxukujoxezizeg.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/819b7c36aacf77e3729d122fb8da7270/fitavudekoxarog.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/05b486525a6fd6f09f61c254a2621574/xujaladike.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/pjjo8mr07o9rc3val8qqudhsrg/61550426141.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/53303510240.pdfIn PDF document text
    • http://fitviewer.biz/files/file/75279298635.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9bfcf20a22a6dbead56d30bf7e78297f/62261524818.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2a148479---752141657.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/78491677906.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kh632uj6lhb7braklpqesu5o58/54892591225.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/baxelobufapejupegofo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec61aa3c3a---buzat.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2j36maf1rapdfn4fia1qelj4k4/tovisekiputiliwan.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46795703216.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///39155398778.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/488d978c909bfc08c0d42851a220f1c1/92492372726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=christmas+tree+spinach+breadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10784 bytes
SHA-256: b1983d0ddb23431c214beeaaec746fa1780b665a0c6aa84c8f7b5b6521cc153c
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 17532 bytes
SHA-256: 77ce2abc3101b28ebd89df8d5e7cc9a7f0df29d0e60fafa80d44a7e105905e86
font_02_sfnt_off00013c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1