Malicious PDF — malware analysis report

Static analysis result for SHA-256 5460618373eeec11…

MALICIOUS

PDF

92.8 KB Created: 2021-08-17 08:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 56393c95e06b8b5b3df67cdf58dc763b SHA-1: 74b7ab50afb8d7bd691c2c47f32dfe51e4163f88 SHA-256: 5460618373eeec11dccaade2cb1c2bea08761bbed38edd2b416f7a565e2f12d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=libro+sep+geografia+6+grado+respuestas PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092b926e5fe4---kewuduti.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gkeod997tfibd5b21h38rf49b4/rekipurovabujatimidemena.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdad18df2e---42172897453.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/torifozu.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/sibokojotonize.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/69796530699.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/ziwefazulatujelojasotexu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///44453551094.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/renavosepeguluxiroji.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rofexejunuwu.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/61932258111.pdfIn PDF document text
    • http://prota.ru/upload/files/nukusewufazobowakenafu.pdfIn PDF document text
    • http://mp-journal.com/media/file/29012899494.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160730d5b81a2c---37370758576.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/vitulafagonomitesibaz.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/risuremaxetibafabesobugor.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ec60660c8036e8d29b9e33a4dc6e6fc7/65834643183.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/46713570689.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/lapefewipifawatiza.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/97407741927.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818262650de---wetupobosedu.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/ladofedog.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1018fe8ee863e17a50352ad820c58321/xitemofujukorabekegalaf.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/varepalivupumufol.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bfb3104683ae6907aff415d7517022c6/kozudolas.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/vefumikivaragiveso.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_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10888 bytes
SHA-256: 73b9c8a04a622cd52c07b41a6567a87c9a56cc39637226086979a5f65310f389
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 17812 bytes
SHA-256: 96334fa24e528912f67e8d51e01e9f85bcd0bb5f4c120ec05992ee4cdc8ffd5a

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