Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2273b27e768db5…

MALICIOUS

PDF

89.4 KB Created: 2021-08-12 07:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc7890b5751ef2eb5d5338773804b5ff SHA-1: 1ca0a146cc6aa4184c09e0f060d47de3bc8e9034 SHA-256: ac2273b27e768db5bdf9b8006ea6db235b6d7685ff0f10e71605c554dfa200cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=free+color+by+number+printables+for+kindergarten PDF link annotation
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9a7ki3hu4n1eem7alk0295rhgr/15183612608.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tewarag.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/sawugunodarizobajub.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bb77c2d72---mugugojirugidupo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/52404109488.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/wevukigawijezosonisuk.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/67058374123.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a66ebb91bd---72129274273.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f958f9fd---20987538136.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/bamewozuvowasowilolu.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/nizanef.pdfIn PDF document text
    • https://semut73.com/contents//files/sowuzade.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/mogovepokozanurez.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c08d1b1188e302d9677f30287321479a/49309960839.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxinezuzinabejujo.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/14138876531.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/ziguxepitunulakixa.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0459ad2bf98afeba20fbba7bd1799280/99643521625.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbc04bab8---wulireketezuja.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932e53d4fac---27387050921.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d138250089---wagagodirozamisut.pdfIn PDF document text
    • https://agatanorek.com/files/file/12278071570.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8ae0c981a41cfc0ae63ecd9f6412969b/fovokiweretuwatunojawi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0c943db8d8e39b3ff50f5cfa8a7efe26/36046042354.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11388 bytes
SHA-256: 36f9f42ba3a9091b6091f652571d361e0604ff0677c554a1a2990eded302f4df
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 17220 bytes
SHA-256: 2646af283427a79d78ea2d42936aa75ba8f99d4e1573d71235b30cb69f98beb4

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