Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2d219e33712b6b…

MALICIOUS

PDF

127.5 KB Created: 2021-07-06 23:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ba4878eb9039c445aa219244ac328edb SHA-1: a5c52c8f88b172cdb21a2c13fcd440038247a121 SHA-256: 2a2d219e33712b6bed4092d5d331d82033358427ab3cec6962d5ecf17b2ba787
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://vistobrasil.net/uploads/file/xiduvapededarugikug.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/da4170ecae1c3bfe9266118271ad04dc/dibawe.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/71348297919.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d81013c023b---toxevidotususok.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/79a0d8437a400a3b5c11fd45d8228d3a/gujexemusativ.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mebudoselowozodox.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/120716c52d4aa5e641ea62f5eb167ce9/98694913077.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160829f98b9c06---ridulipi.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105292117281584.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3915428a0f45ac0f5360a8e2558f138d/80370067992.pdfIn PDF document text
    • http://goref.ru/files/file/vedenegivobivusaro.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7vid9ibpdc2cg6j1nkdd45hg7p/liwipefelibimurinazuxanu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b24be1c1---wifodeganitudibiravip.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7d48236---fudod.pdfIn PDF document text
    • http://promador.pl/userfiles/file/jakuras.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nuroxevokoj.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/saruvakiwulafa.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/1611786954.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a736ce2bc82---juritede.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346614ebc---ronij.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/wejakelobobozufidezusirar.pdfIn PDF document text
    • http://yuhongzg.com/d/files/wovexetosozejopujerugo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/97202492306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kyoshi+avatar+the+last+airbenderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AE 10656 bytes
SHA-256: f64ff5925b93456d6c82f33e76d04ea65f49582d1b4c221d50e1dc4088d220a1
font_01_sfnt_off00019f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F04 2164 bytes
SHA-256: bd60826d4335a8521edf08de5e89614b59bee7671a28613f1c93080211ce2fd6
font_02_sfnt_off0001a8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D6 17224 bytes
SHA-256: 472dfe6eee08d0df164a6d9c5ccace4d97652648c19f57696ca7df308b17cc52

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