Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d95ee2f6d2830c…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dbb4a7b86f9b0c839b13d6454896b224 SHA-1: 72fd49fb050970d47f4c3953591200db33851265 SHA-256: 37d95ee2f6d2830c32817b3bc6328034782786ca981db651bf5e61c7dd665987
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests this redirection is malicious. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/17ae1dbb7648cbd00cd1280495f28f28/fojezik.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d0do8kp1atqb29ao9ml884n7ov/37919187522.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f61c7126---jetawakorutalopuwunip.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/021f23a6edb4d93ff8823493ebd8d66f/kazitefimofanenibusijon.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/82558184883.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7d90d89139916842212e390cf1a0142d/9819275722.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/73a90f310eb5c9f976fe7e0ea3bab48a/mizagejasopuseb.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/329376f587406b33df4c3bb1b8446ab3/xosuvokubebaxu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/55603261833.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/43914a762e890130b1629baf0dd12ab4/38736475159.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zoduzofofuzamuzusomen.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff933690c4.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2686c9e5---12284632108.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a208e2d93f313b240d00efd17c8f8582/52300416297.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/daxadogisixifebekiweger.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e786e002---35299189665.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nusufadaxufujilutiwedot.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75b7d4402---92148986247.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/k9du6g08bdkahnq4ugkas2q9o1/19766246886.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7390611173---73432192130.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/69ef835a6a564c000a94d6b11c6ec5be/jotevaxidonevivanik.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f6cce4dbd4912616357ff6a720f61af/70876641597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+1+ppssppPDF 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 9980 bytes
SHA-256: 0faec3b546afb9f3a793ab3c71d7285afe2b41c2618801abe9cb7c8c84b9949e
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 18976 bytes
SHA-256: e89eac0367ae16cf55ea7df9a53330cce3f70cd574029dffeae4cbc487f5e376
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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