Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1e712dd299c13b…

MALICIOUS

PDF

96.5 KB Created: 2021-09-16 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e578eae079c4d7635eced5a705778e7a SHA-1: 110dcd2d0bcd5f15724e7d9a16b4438772abf21b SHA-256: 6d1e712dd299c13b4eed3dd619c0f7e0062fac166d32c45930641cbfd36147ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. This is a common technique for phishing or distributing malware by redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ukrainski-rosyjski.pl/userfiles/file/34806551038.pdf In PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/4602086414.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/xidugo.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nuvoketapisog.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/palerodovazivifavuwuj.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/93119009264.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_052502.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7f58d4f0fa98d67e06b463cf1afb17b0/88421364789.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/fiwarujerigusekemekopasa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xenojorepag.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7b435dc3---40423105068.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/64354584033.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/dac5debcedc76a18cbb53e4542a4e63b/62148242453.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb88f1825---jesakanaveviware.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/14768332444.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/46645820645.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/81297133329.pdfIn PDF document text
    • http://zuszdounky.cz/files/gofiwegiriki.pdfIn PDF document text
    • http://regcureguide.com/files/files/wuzewiregigivixexo.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vojenudub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+qu%E1%BA%A3n+l%C3%BD+file+cho+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16164 bytes
SHA-256: d7da5801168055627cb676c8436c5c866750233ea4b9482c0e601307330bf0b5
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 26940 bytes
SHA-256: 134012c84e96d686fd29587ca3f857b0bcd7a9d7edb3f84a51561c58f2f8b9c5
font_02_sfnt_off00013f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 11480 bytes
SHA-256: 7557768af44741fca555d0abd53ecb6bc7f555d7cf5eb2f1d50cf57427260673

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