Malicious PDF — malware analysis report

Static analysis result for SHA-256 249dfcbefd6474c6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 15:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34557f6e031052593f7f79ee143502d0 SHA-1: 3f72e04e5fd5def4119b5acd4556d05609e717bc SHA-256: 249dfcbefd6474c68b5890d73e749384719e0197f30711d212e2369a58d470ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to leverage these sites for distributing malicious content or phishing. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=lottie+animation+android+tutorial PDF link annotation
    • https://uangraja.com/contents/files/zexowumipo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc63e1a131---38647876655.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b2210a90---34558360538.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1032070a3---keralakusazigez.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/galiguv.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/rogijukoxizosi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/tusiduxijurawazu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1de427d---dediwigalonekarujigap.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/dipetesagoxapunopoxere.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/91298541174.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/24766165058.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/posekupuxizagasotakunexem.pdfIn PDF document text
    • https://afma.pt/site/upload/file/10562950129.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/32180089854.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c63de210---54048222485.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/wafegipe.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gufatekamig.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d35c4edc---35605019809.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/darot.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/subajalanuwolarupan.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40475499069.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jerekafanurepixiv.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/jonoluxoneta.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 18328 bytes
SHA-256: 5dde409c2f7054694ee3d1ad20a481064b60a287565518aa0ec522c004f1077e
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10300 bytes
SHA-256: d696134cde38a3e935d8eb44abd215e0b2fb39441af290864716dd3382cbbb79

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