Malicious PDF — malware analysis report

Static analysis result for SHA-256 a100dde09a5ff379…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 07:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bae255c5660e9acaecb75922005413b SHA-1: f3af6cfbe12a091062012e441a2601ab6cd24aaa SHA-256: a100dde09a5ff3797c73da65d3d5a2f81f9eb17eddf47b52dfd057f57f3ea1de
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d87odlek8hajb3a6b2stkf21o1/43701009456.pdf In PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/55843322034.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/52149493699.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075746368885---lojabugipajuwusexakoluzoz.pdfIn PDF document text
    • http://airsoft1.ro/files/file/80040354058.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/er9mqs77kkrfv9tkhnt42fmg3m/38388825275.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/52780392714.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/6ds3d3r5k232p9cc6o1vqh1048/favajaxexopi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/fuzemidanabegeper.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/165e7b015213d04a8881b24e74f78abf/48350822647.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a06a334ce1c9ade09fe79476f5d8d38c/luzexotefolexojosujoweve.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/94681384376.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jirikinivumizof.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb634c736be---31770127814.pdfIn PDF document text
    • https://primer-spb.ru/files/files/gajedolezo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910e3c4f213---rifusoduxezepituw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b070f738c6533b7b83707ee3d6eb8fb9/20303881154.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea7309b1a---wobinupezavu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ecf79f9f09e0042139af1397a870e5a2/xemixumufumewik.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a9e282c4591a3a96aa78290e89fcc8/21013741132.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3bbf66f2b83c691e4e5b348d78522233/nekaxivijezakewipafuso.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88eb86fc8---39109884017.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbd45ce36---suwodulubosutamutixito.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/u43oq85j27ldgfb1f9j5im1ubr/xasipamimawofugobix.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7e013ecb---20452113830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=real+racing+3+apk+unlimited+money+and+goldPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 17444 bytes
SHA-256: 5d5899182286b916774886b14fed44a66897c9b6c5b6a711e426b79002e38d6a
font_01_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 11212 bytes
SHA-256: 2d6df1dfe1342e7c1efadc770b40eb1d7f24fc6f13909c87d3f5d17effeaf2df

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