Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9ec7a947422ec1…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 23:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec99f87a00dfc56d241031eb90274f61 SHA-1: 7ad82a91f791e696aec922d09c69f7e511915c4d SHA-256: 9a9ec7a947422ec1f012096493a91655d9640bcba38b7d5d480fc85595acee2b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://philabc.ru/uplcv?utm_term=barnum+and+bailey+circus
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a935913d51f---58601636327.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/f136eec90bfe8c860d0c0ee84de3d7d3/53722998379.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d4a1ab0a7---95062049567.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/097a0d80b26069c9ec798d68d04b303a/16931740023.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6236c517---supanulivusakasexopanawu.pdf
    • http://mobydick-band.de/fckdata/file/vupoxasubatatolat.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1cd356be0f94fa14c5a5a17f956fcbe9/migosor.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/94260211776.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/nifidep.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c8f70e2d---widogobifonetusedaporol.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gcdtvk3ji9h51j8i68647g5u9f/golovivigijevugulewid.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mko6dmh5pshp8fagdau12gdep1/povakaremoxabinasebunam.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93a7f333b---25133098219.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73f5721aeb---86443541541.pdf
    • http://megat.pl/uploaded/fck_files/file/noxabafovapopanilulowoxal.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3610148ff6---pasorarelesitami.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4aeac6882---xivopevidisonidebapa.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oiumd9j199cniv91045mi9o55n/xejeb.pdf
    • https://snqrsl.quebec/upload/editor/file/73668942530.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5hhidqa61fmd7p2f97vnhjsmp4/39943822228.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763221e889b---11489941511.pdf
    • http://fsoa.cn/userfiles/file/39703947323.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d67ac41380d---5058203412.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7bd7fe4b---8064060637.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e791351a5d7e8fffbbf37be74e8ab5c8/xusumetezafoni.pdf
    • https://planet-pvc.com/upload/files/33698564280.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab7df311a---30696972676.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a4.bin
9112bbf6bd5b8ed08bca08514e217f626c0038707c325977eb70b1e45d951cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10720 bytes
font_01_sfnt_off00010b2e.bin
d7e887a7673fa586e1bead5f96f137bff954274a20770b94dfaa4f255ed13fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 18824 bytes
font_02_sfnt_off00013d4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 16792 bytes

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