Malicious PDF — malware analysis report

Static analysis result for SHA-256 091b590090ab6d4a…

MALICIOUS

PDF

95.6 KB Created: 2021-08-03 16:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bf2462cb2731bc33d645bc0b13a37784 SHA-1: 63d4e1ee7af672818aa05f7c6bbf1e42447aec14 SHA-256: 091b590090ab6d4a40ff0419e329ae1496dedf7a7926f9895b6165922bbaea94
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dewalt-naradi.cz/media/upload/editor/file/betexexif.pdf In PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lidt48n3n0eefg68sfg9fp74ud/92165877183.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jesujixizuzusix.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/66820732464.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b1fb515f58fc9b7c4549fd5da49c81a5/7710249019.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0065c180---65750344186.pdfIn PDF document text
    • https://tisuputih.com/contents//files/damifajilurir.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/falipoxawituxexijusirunu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/93677711492.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3112e601d7---52627799837.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae26015a5c---xatos.pdfIn PDF document text
    • https://iwistw.com/upload/files/radamedogegunilotitesu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a322d45e5c5---54267379739.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d09ff871c1fda8d648d4cc91d3105b2f/13939406523.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b2e778e2d---bamawinorudozatujofi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdce6a4cf---55198701091.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a256f680a2---senogevutiji.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/11285656584.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/49001391312.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/55491254122.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7f583e19---14678648024.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4e8e9298---roboxojowukaneg.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/8523591388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+clear+programs+on+aqualink+rs4PDF 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_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 17576 bytes
SHA-256: 86f36dd24799be3a69ac4b411a46c6a9446d14505c7034b7730663b1fe2ecbf6
font_01_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E0 11208 bytes
SHA-256: ce52d7df31b845f3132c4e92decd143c78680f0175f609f24b3a16df6507b9fc