Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ff8cc99fef31db…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 01:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9fe7ce3a1776d0a431e616b80ca8795 SHA-1: 815730457794dbfed1decb4c7534482dcd3f0fda SHA-256: 84ff8cc99fef31db6ba21adee018cf9b7bff07e6cf650da39aa7d5fe793ce554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=php+manual+mysqli_connect PDF link annotation
    • http://gongotour.com/FileData/ckfinder/files/20210827_092ED8E28639E40B.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e3c0174c99f0e7d7978bf28ac0f6fdbc/lipatigebum.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gemusufodebadusuxitera.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/33530025572.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/75907380513.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd453b8752---88859828815.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/85591954298.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cropnodrsf4m7m0jbbjntfr1g0/lovexe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e3142615413b7c482790fc49f90fd3ce/42915437210.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/862d8c7c3750b5f4cf1c4e21e152cfdc/53705533657.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/kuxumarakagujasanasuleru.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/38005800142.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71bac7d076d561f22311bf69be74d4d3/51537496877.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7b6255ac---gogexalomonawemofowos.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/78393029858.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/36845996775.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zapiv.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9c4d3b7a1914f6ba7992f4631489d406/gobirukuraduputiwu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210812075348941100ketn8.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d91e0ea72---pevijebesuzajomojuwamo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb528fa66---lotasixiponebujixu.pdfIn PDF document text
    • http://cpviettin.com/upload/files/90131745109.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/likudalinu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/743062ae8d0ccc3c08f5734015c460fa/35001711186.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c9396e3dfbe74df9f543724d293eb97/24780905049.pdfIn PDF document text
    • 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_off0000ce50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 10932 bytes
SHA-256: 905ba2fd9f85af5e23ef460fd027e7986360c986524a0359643f26d574999515
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 17972 bytes
SHA-256: d9f9d3b031b2f13bf32f17d4c2dfade52c48ba92510b9af02d5a380d1cdd44e9
font_02_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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