Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82bfd2cd3bc3da8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 01:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5bad4576269315b21a55e357fb81677 SHA-1: 2a776695947e0214858b80146bb8ddfd7869f315 SHA-256: b82bfd2cd3bc3da82996d28f2101911c72ebddd9cd6ce4afe31beb552b424c99
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to download further content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://musiclivemarsala.com/userfiles/files/vekaxe.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137159792eee---rigopubef.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ce074a5---poveweteduramuwelot.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/84700198642.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jawopedoluxexa.pdfIn PDF document text
    • https://tigaintan.com/contents/files/97006608283.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/56155506955.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/7978316417.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/gafinogowexob.pdfIn PDF document text
    • http://stevis.cz/files/file/wimapojazomebawugor.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bozulegojekina.pdfIn PDF document text
    • http://nktrading.qa/file/files/wolapesofafefuwexajije.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/9703388204.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/jipufupizabamuwaluj.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/45860507902.pdfIn PDF document text
    • http://caythuocnam.org/images/files/losirupezomusezojuripawiv.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vomol.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210901115828551279.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xepopuvirumekelabuvet.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/13434326320.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_793022286B1705ED.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+video+show+premium+apkPDF 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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 18048 bytes
SHA-256: 70089d6233cd21f8995f645b67ac3cc687ef1f679f112d87bf6e88092779928a
font_02_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 10904 bytes
SHA-256: ac2d56e7b028efe05a8d2dc78edf318c795ea4a7625b156e173e2e3a623afa36