Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd38a7f25d3d6ae…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 18:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d24e2f40c53d6bd12fd8c370b852e0a SHA-1: 433764a251b279495dd3f8e97e8d44743e2c237d SHA-256: 5bd38a7f25d3d6ae5dc0075220256c714902d2fa219d0fe3d04d6ee121de04d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=dialog+3g+apn+settings PDF link annotation
    • http://kryotherapie.net/neu/userfiles/file/xutirovefotosiv.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/vebitukonafomulalam.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/5815564143.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912105809.pdfIn PDF document text
    • http://360global.ca/userfiles/file/tataxuvowukox.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9c973794310353f721ed610f0135a3a6/63229454439.pdfIn PDF document text
    • http://freewest.at/fitutaxowepazovog.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/retomawisoxifipazovo.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/88003232842.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/69147359509.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/difakatejetelidawu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/692b8441ae81f2ca7a7921e0673daf1e/nulotowudopuzazeli.pdfIn PDF document text
    • http://briztravel.com/upload/files/segolumedudoronilej.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613232829c747---tigafetipuzezakidaxoxaru.pdfIn PDF document text
    • https://csn-alliance.com/data/files/gopikomuxajajajazixewijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd90d07c---57796728527.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jinumikosopugebisereva.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/repirezupotuwuwovaki.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae2d52e1c---98292818594.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/15911484532.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/58179006527.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6cdcb16d---rasujajisezup.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/giwanadun.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_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 19200 bytes
SHA-256: 8f175701f5493db3684addd6c15467cd8a67347bdad2974fb69a872d2236257b
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10500 bytes
SHA-256: 2956d342b59fdc9e2808341b6fdf108d417d2711094971bead94efc9ac8b50df
font_02_sfnt_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1