Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16a4f051f0e7e1a…

MALICIOUS

PDF

82.8 KB Created: 2021-07-12 22:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35b071895a5a34e0f9e12ea7b2c1052a SHA-1: 980139da94c3b7922799c92ec9c593ccc28410fa SHA-256: f16a4f051f0e7e1a1365d0b128bec71c18006fbfd66d03747091c8d4c912493d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as the one hosted on amiablediamonds.com, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a95758c05019fea688c9bc4649b87e5/baribokatubekopufu.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0276d8e43da39aaddf9252c8dbfedbc4/1892666942.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b489305f6c8---wemanofoj.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2e5569e9fcfcd4fefa704a08259b3e4d/91641517421.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe684abb3---zivowibusozas.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0c590520ab0eb0249ea51e5ea6bff9fc/maxadidezafifojofab.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb56405c4---dizaziri.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/033497015acd8eea011ef0e262e09f27/8779334219.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/liworafujogifibivevexawo.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/mavifububowepama.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a780af7dd5cec88c88e460b211f3c951/busoniruguwuti.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64dbdefe---3358614349.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pegogikijisuvubagijajune.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b352c5b78---32579452170.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa163fa69---27940145816.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c131343113a32b40bea34cea56811485/safavokabor.pdfIn PDF document text
    • https://360mart.net/uploads/files/66694906575.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/33606342973.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/desuwepuweme.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/15463786775.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nojelodufikowabe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/78178336228.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kapotofimitafuvanatilop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=type+1+and+2+heart+blockPDF 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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 17692 bytes
SHA-256: 35129f30ae5bbd07f5a1fc7005f41014068a39902895e3bee72b283c37af6c09
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10832 bytes
SHA-256: 17a657c87b746caa773e4d6adf2cf95875c9ed9398a9b16af389e20b12e417d3
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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