Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fb7b5f6e289bb5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 04:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4b94065f688dfebcd058fbb4b539234 SHA-1: 3bc3cc90246a09073e995784e8ce3f1245e22f3d SHA-256: 45fb7b5f6e289bb54b5af5c71a7f92087732e168a997372a0cbf7f3bfd82b3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=gothic+elements+in+frankenstein+pdf PDF link annotation
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/fijasozufamidabod.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/wojikelujugerigaxu.pdfIn PDF document text
    • http://seamacros.com/upload/file/95232859818.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/wotojelu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/fewujul.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abaf9eabb9---27197470620.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1t2mchlplbkfb31p5d9g0j04i1/34337537083.pdfIn PDF document text
    • http://identik.hu/editor_up/suvetabebox.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rimiguvutiwatulaxi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770996e1d32---23283579539.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/45290081531.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jasuk.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/sevedur.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa63af048f---28236328311.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1aacf083---83272295224.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210713212714.pdfIn PDF document text
    • https://jurad.eu/files/file/77755601593.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wolavar.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210701064351.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607224fe37cf9---52642863343.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e4766732---60504185408.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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 11016 bytes
SHA-256: 83d0ed59ea8e4a38df8e63db99809523b73193b9743c45433159fb0c147a4587
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 17344 bytes
SHA-256: a65f6269cf8ba6c47124f380e47021e859dd6c99b6f535d59a011a7257952baa