Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc91208c547f5a20…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 23:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 006bcef1bc6ba164c3f348db0165b33a SHA-1: 6f258b20f1e2f277468efaca3848366a4e0fc8b7 SHA-256: fc91208c547f5a209b6f413839e9f9c754da2e3d7be447afdd8a791e34fa72a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The presence of multiple compromised WordPress upload links suggests an attempt to host malicious content on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://cructi.ru/uplcv?utm_term=download+subway+surfers+for+java PDF link annotation
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/jawize.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/63200c19f77bd8bcd3f091f187f5e4f7/14995419962.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/71195b7825759ac046c3e7dd47590873/89248718484.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072751be82a6---82131037331.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/1138795219.pdfIn PDF document text
    • https://digireg.se/upload/94000443918.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4470a301---dakijakizevepafafadasire.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6b496e23---vozovabixesudo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dojimabakezesaligebi.pdfIn PDF document text
    • https://termoformat.md/img/files/gifekudolubewidaje.pdfIn PDF document text
    • http://yoron.net/up/files/nekopoxu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4ju54tpqbe4knetee4gu3s3s0c/90208191350.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cbd1f071---59918585846.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c4399f98---lujidilovikepoj.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/49255488247.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b32bce37---87911141563.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/fajfm9m2ddv9l836fh34634h36/27390379103.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/veridojararevovuxodotuvun.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8b3c2e6ab434e0d538755af7803c193b/rofagananedop.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5ed08fa0---62386337230.pdfIn PDF document text
    • http://keacg.com/upload/files/tedafunobamiravupoz.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/591ddc58c933a94e033f8fc6e7c852ba/13193418759.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 17984 bytes
SHA-256: 74e67b5917787a3af28a0e9a4003d8ae0954bf8ccffd99a2a2de2f91bc781fc1
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 10796 bytes
SHA-256: e464c9dda8ff3d18dc8e448850bd1ec3dc31cf5dcb648a0a26b69d7a0baade7e

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