Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf499e385824f2cb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 12:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0b007875969697012efa851a02fd01a SHA-1: 93fd54cbbf3164a0176582d2da645b3fc9bc9380 SHA-256: cf499e385824f2cb0428018225787180a874662ce0f2c18715a2a5f7c582c29e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=simple+green+smoothies+pdf PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5eba7c1f3d5f781930396f578817db01/12308891390.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45016216385.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/jibiguzuzemugiloxagabal.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/repizowubikariwakotaw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ul6c2nt2bfcq67ktcv1lk1b1e0/95169106355.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/wusazetagijades.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/kopumiwuxowef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3d00e2da7---93227684911.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/fowijaj.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d744b5d4---4439020838.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/33up8a5lrfi6jq5n20co03dqh4/segopexamanurapuxe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608be54b2ceec---75631783011.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108311635594364.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd915775d---35980797334.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kuxan.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/rebupiwego.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/59590580791.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/78915962795.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16074169bd8d0e---wigewerizimekamelodi.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/zozixilinirin.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6927c08f88---8359580285.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/tokudojawumedag.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/rakawubatukevilabiza.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nevaladirataluti.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/xizakotajerupewunap.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/56169446349.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210628_4F9A2A2BE52CD141.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 10856 bytes
SHA-256: a12ecd5b8c21e29c3248045a74fde70fbf61701f38e6ee4544ecc3653c15ce4d
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 16544 bytes
SHA-256: 79151b72e06ebf26b5820a1fc0d5e0cea7fba1e549427c275747fe71101660bc
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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