Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2819b4f841fa962…

MALICIOUS

PDF

76.4 KB Created: 2021-09-25 03:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e642fac2bd094bc863258f0635d5fda2 SHA-1: 58879c5624101401221d6bb58da8dcfe6058e427 SHA-256: a2819b4f841fa962dbfa74cc87415ee8fe5f7d902a29d2d72f30623743ebb819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories and other disposable hosting. While no scripts were directly extracted, the nature of the links suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613686514e55a---nabujakofirurof.pdf In PDF document text
    • http://phongthuyphatloc.com/luutru/files/bedelos.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/pupakazumewelete.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/janaributinejoxilos.pdfIn PDF document text
    • http://actinq.nl/upload/file/zapifigedatus.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/36143085582.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/muo3f0v4ul62lktb7gb2dteu75/porogowetotosevo.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/59689820657.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/podofasutosifemi.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/wugekesesopuwine.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/memisosuko.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/80686069877.pdfIn PDF document text
    • https://ibericadearmerias.com/file/87538072856.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/83629049525.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ea68lldh1490qle7im1aosfsj6/gopiwezapezibafixo.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/41814247332.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/podivodejogibazi.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/18500141552.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/50650784472.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/zuvinoligepalejete.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/55bcf9f2369ef82e2e7523da9025a636/24944241921.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51039653001.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/tigoguj.pdfIn PDF document text
    • https://mklaassen.nl/images/file/89418100788.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133196663bcc---69618689178.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/58251843782.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/21063769648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zombie+sniper+mod+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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 10604 bytes
SHA-256: 721bd7d0878e7f5ba20e39c5907cbb37b9d9f5ac0659f76073e3528b1a59451e
font_01_sfnt_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 18456 bytes
SHA-256: a6d3a262ba9bf71f68eaee00afd8dee523e729452250de5e5bb96bbf8d8fd0a0

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