Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fcef99de16540e…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 04:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0847e74fc57a0df2095977c76c522730 SHA-1: d8590a76eb446e131333da2e2a93f7c1a07efb08 SHA-256: 22fcef99de16540e1559e866ff96f074ce132e9cdbece5976540ca19ebe765f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=pdf+size+compressor+100+kb PDF link annotation
    • http://naphotelbangkok.com/userfiles/files/41353227217.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d8312eaa42d648d4f4c82488b4eb37b7/goxuwipimawida.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/92116660209.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/l83isibl26rpdjssr03v9fhmo5/lodubowowogarexivekajet.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bca299066d4dbfb7333bd1708b049e60/26351823818.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608682b38f230---31075965551.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/558b48076e262e42e6ecd71788d19602/13836810007.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/fedenomogiwodajas.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/kinufalogujiborazedafiz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da2ac3c61---75691813928.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/24673286036.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/41692361867.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ddce20f3---xajarikazabakiganivirazir.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/sibisadavuwoxew.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc6ea8152---17529791330.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/82831164617.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98077690983.pdfIn PDF document text
    • https://egca.fr/userfiles/file/rimegizubemajumerogabodub.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/98552293129.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b3310f094e1b74c0092211eadf302f05/83019250898.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ace25abfb---5817685635.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/80391578862.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/61217995144.pdfIn PDF document text
    • http://rc-modeller.se/images/file///75821727019.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i8s2hqqoso0j8nmglbcqqdm7h/9034008520.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 10840 bytes
SHA-256: f4f09440afbf4a1087e26a90b779b9d5a39983c7f2cff87fb1079cf8538d4ccc
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16948 bytes
SHA-256: c14caf3065d5463635192acaa35f231c487e2465c2ba00c4227dc6daaefd2f5d

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