Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ab4e4d35cb969e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 047146ad0364062d84a24b5ebf345005 SHA-1: fa1a747ae553b4cf86e706de4b9678e572b3d82a SHA-256: 05ab4e4d35cb969e60c9dbd41d06104460a33d2cb1572f8580f86913104024b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a single link each, often with UTM parameters, suggesting an attempt to game search engines or distribute phishing lures. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+see+private+account+pictures+on+instagram PDF link annotation
    • http://ituor.ir/basefile/chartermeinfo/files/vawawanajarofipijagane.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/gemem.pdfIn PDF document text
    • http://uco-kampen.com/media/files/74691902265.pdfIn PDF document text
    • http://biosite.ru/images/news/file/kodamumenezosupabusajogo.pdfIn PDF document text
    • http://woykoff.hu/upload/file/26811853080.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nudiwunotajamanelosulomax.pdfIn PDF document text
    • https://ottopianos.nl/files/67844896783.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495085adbb---55611446919.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/59611207997.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914170954_s3y5m5.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/luramutipinowepub.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/46563896779.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/78854577825.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/11515496534.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614541e871fd8---33808351429.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_4FC1B0BDEEF3006B.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/mitafamazofovonukalube.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144564b93f6c---15126420835.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wogajososoviw.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/xotexoxusuzubo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/78bf60322fef08da2d1804c5559caad0/28119793862.pdfIn PDF document text
    • https://blogsma.com/files/52916229655.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 18808 bytes
SHA-256: 43647e35f68b2a026f56d4c0700fb3c50289106dc009a33cae644ffc25ab1d8c
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 10916 bytes
SHA-256: 63cb1bf8a66a6e3f54bd7986ef49bae13a2a401cf896fc37b598dcb70f172fec
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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