Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22f0a262efa70d9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 04:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0dee9c9925511f096540ae736b8c663b SHA-1: 6e8ed8003f579e3ab5a38c4d18e98d0454b5a779 SHA-256: d22f0a262efa70d90f524ab9c9b908a58f71a210baa5f0a466635480b46fa5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate a link farm on disposable hosting and links to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 http://hla.vn/upload/files/govulu.pdf In PDF document text
    • http://xinyuemu.net/assets/202109/files/20210903145650352087.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059502993a---68432569379.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/32765111407.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5fa3196af4e75ea63f7f030d09fc52d1/jemorufilepapozosuka.pdfIn PDF document text
    • https://12shio1.com/contents/files/nimetinepuzubetonivifukel.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/dapimalovizunasosu.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/velifimawivoledirokitija.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/83617552270.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16135529f1811b---95703808004.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109020448173522.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/fememuzukukofajebusotubon.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/favipaxebatukabevowo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d9f75d6078c13fc02096313ec67d6cca/dufoxovoru.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/58686273899.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210901_19670B628BB3640C.pdfIn PDF document text
    • http://youil.org/userData/board/file/gaxabazakozuxiserivogi.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/21704854131.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/bubosotusulawir.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb28798a41---dadokuroxi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/17718935862.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4d260393e855727064e67213855ca2b9/wumedofe.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94491418275.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/6820743961.pdfIn PDF document text
    • http://kvrhousing.com/uploads/61256698247.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/jikavuvogukaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scribblenauts+unlimited+modPDF link annotation
    • 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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 21456 bytes
SHA-256: 409e753c4e320ea636fac3cce3d0eeddd0adb46ead3e7c6b5b3c0cb7200bf119
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10844 bytes
SHA-256: 321738e370d0defcd7dbd102ba6a105cb36ed807afa255630e2cc18aadf0457d
font_03_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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