Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab11918e5c793e79…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 06:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bee7c16f930547720d2591dd1af4041 SHA-1: e9992026e1c9a3597bf655b83e144988058f2387 SHA-256: ab11918e5c793e7975fe24be2e36f22fdeaf08b0252bb405fc88122f62ce0635
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c2768056278---5626143117.pdf In PDF document text
    • https://digireg.es/upload/wiwopob.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb20dba677d---fanutatebikadina.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/12069447725.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/68139824350.pdfIn PDF document text
    • http://huimao.com/upload/roneravodesusosipadi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/zimadivelufusa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a85e0a65aa8e4b9e2c73638a77e99092/54027511424.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6d566101---90508832160.pdfIn PDF document text
    • http://capital96.com/userfiles/file/bisomo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5kke8cm4l94jlksa678l13f8c1/jotatev.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85368643928.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80eaa7075---nesebijotemewekuginotagu.pdfIn PDF document text
    • http://grimastone.ru/files/82400776566.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/72872803178.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_544DF56969CEC7D2.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/85260352068.pdfIn PDF document text
    • https://morabia.fi/images/file/62045898101.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/91430001733.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/55370054996.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gavafilowesod.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pivovimejevanavega.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/sorowesogewosomarakuvivuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=electrical+cable+calculation+formulas+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/26135896298.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 11004 bytes
SHA-256: 6ec6ea49c9b7390334e3306286c9019e70290199c36cbf98fc7b6af1077eb204
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 19756 bytes
SHA-256: 28f1a93b8862c6d71a9ad32638669e52edb4dc2d91bce9d2dfbb0a2b4c47c384
font_02_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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