Malicious PDF — malware analysis report

Static analysis result for SHA-256 39275f6a7ac986dc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 13:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64b69657c24c1da50332d35219615f52 SHA-1: 530ab52829b60258bddcb08518e2d483b563ccc0 SHA-256: 39275f6a7ac986dc27764837c41c9d76cc8118fcc1fd897e1c85ec89627beae2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arab-hams.com/Ups/files/36964542209.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6f119e58a7fc0779a54278d0885c9d62/roxixadubilitek.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b58cff6c---25684268570.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08522671de---99376855302.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/manufawa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a3365ea94bf7f1e8f4ea7c6f4391cb9/5097741903.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nfkfthpug4srge7q15dcftkvl9/49084607322.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/josagavuvofoworogagugoni.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/7000662121.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e981818812c62eb289082fba08a8dc8a/76465908231.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf47e1dd35---72116947599.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/17450895389.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zemulitozevuda.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112711a1e106---lajudufodalutosozeremuk.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/naborowakuribor.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/bikokuxipeponex.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rafapodazelaxogepod.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60958b5eda5cdaa2638c7fdac30c006f/zurivugekubi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/notuxixasizeri.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/56165655488.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pasikabo.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/samesape.pdfIn PDF document text
    • http://mega.kz/media/upload/files/wofuribagu.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/zevesugewikoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+old+rugged+cross+hymn+pdfPDF 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 10892 bytes
SHA-256: 24e39608849526f79e88de7ef4c8ace99cc1bcbef9a0148fcaa0811891d9062b
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 17560 bytes
SHA-256: e94abcd9537a79ca6e0c167c0f726f6fe1f5d3e6cbe1763795914099886f98fb
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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