Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2defce7edf04fd8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 07:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5166faa44560bf8b9057f8cb1fd8c150 SHA-1: db5dc7adeee15d163ad4c41e04ef4fbde6701176 SHA-256: a2defce7edf04fd8e9e3a56d8add2ce41eaaa427f0f5d6911c9b01da8fdc2e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=minecraft+bedrock+latest+version+apk PDF link annotation
    • http://www.oomewatersport.nl/upload/files/pagiwebatinupuku.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/93280045114.pdfIn PDF document text
    • http://techbis.pl/files/file/zolugut.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134705e83bf7---55683415484.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/dazolitixinavekufomaba.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-20/20210920070315772064.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/fosor.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/mofiwujusu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/86584233021.pdfIn PDF document text
    • https://dptech.vn/uploads/files/zudoxosoxupe.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5cb82557b3a57dcb7377c7d2cbb3054c/luduromadezufi.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/64076281339.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/geruwiber.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mewexulur.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/ximis.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/vabadirodabetelowakaw.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/ridafanamotorevagowa.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f93005bb298f4fe0411b61fcb636600/selilabexenaborasesajinab.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/1183775783.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/xaligokubogilegerewit.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/82415041380.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/7922669883.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/68500811693.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/49240893971.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 16472 bytes
SHA-256: 61287e2542e41b5baf9cc0617efbe82c2a8c3ced8e2b01b2b63137e36f7f0ef6
font_01_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 10904 bytes
SHA-256: f45519a47e271d24c26e3a71c75b294ff2c5aa99c9409642326c4dae73682aa3

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