Malicious PDF — malware analysis report

Static analysis result for SHA-256 b374e3492456874b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 04:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26f94ce9b7920e42d81bbb377782363d SHA-1: 12b3d4221e83d3dfd3be5d3e297de25835f7f04a SHA-256: b374e3492456874b5561de808371991cd77c1de339e399d7d7ee1c1121d81b2c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely serve as a lure to redirect the user to malicious content or further stages of an attack.

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9916ce23---gevaduxoperomu.pdf In PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/18334175900.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/kakukuva.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/dukogikasanazin.pdfIn PDF document text
    • http://mobilenmr.com/files/files/tufadus.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/b6f947ac4cd6b51d5c7d9a29cdb254af/zepep.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b354b4b5a---80096268956.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jovomusofu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075824c8cc19---24523810856.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9013d896---gutewunew.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/82058900986.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4aa80b8769b94504968b591bbbe4d5c3/40786361835.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c42621e4---wadogotewuredebaburi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/36311946390.pdfIn PDF document text
    • https://csn-alliance.com/data/files/66853338568.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/somobop.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6016dbf2---zabevuvurozivuxodok.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080de0209dc9---245988803.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca62c20986c---ritivonatadulexaw.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/pafekovedovibilof.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/20950908142.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b28173025df---156768459.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867239846f0---54538138849.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/19001430096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=morality+in+ethicsPDF 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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 16576 bytes
SHA-256: a9f42ccc2be4b821748f0df6c10374f96efefe74717efad158b48e85096fb2c4
font_01_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 10432 bytes
SHA-256: 13cb30f47a8cc275b274b7fbafcde98a01e9288c74bb97cb648ec02d1d138f06
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1