Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a8e5d2531fdf01…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 17:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b10a447e3970f0e30f6e8e810e6a1fd SHA-1: 5a983fdc12e83a8c73001f711c851200653113d8 SHA-256: 65a8e5d2531fdf01bf0d9e45e2c08682bb86742fba0ecb257e3d06802c2d2a2b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests the document may prompt users to call a number in a deceptive context, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://agriturismolescuderie.eu/userfiles/files/93610139534.pdf In PDF document text
    • http://icbiz.ru/userfiles/file/84348438564.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/43663833738.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6835cb2a177a64d61136a094f102b4de/zefaguvigu.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/62379082003.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfa8930a4---gepofubikuzinekexevodiso.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161364b167ab2e---rixodikixaforotowu.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/12320716850.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/wiparamodis.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zufadojatovor.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/23858128035.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/bikotugaji.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613663a30975e---77126888369.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/22822914671.pdfIn PDF document text
    • http://eva.am/files/a489deba9f9d9e54.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/63714592596.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wutijobudogabo.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/19498924880.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/32656813755.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/wubutotumafedomefopeni.pdfIn PDF document text
    • http://youil.org/userData/board/file/68482076024.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/85072418426.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/jewegidob.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/8609752092.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/21004499227.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ded409c---vudemafifafozel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hang+em+high+full+movie+123moviesPDF 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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 17804 bytes
SHA-256: 5dcd6d6e2fb5f079daaec23fc11a11990e4daad6c334c9a4036b0b7ddad12d75
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 10964 bytes
SHA-256: b921935af28fb55cfa7ca3fb9135a85a3cd3681c84c244f419651d74290deb14

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