Malicious PDF — malware analysis report

Static analysis result for SHA-256 40127b0babbb0ec2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 01:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7779fa0c3046eafae0f725dcf2b8b5f SHA-1: ac547c0d958637d338cfe04dd17fba37e0ed2196 SHA-256: 40127b0babbb0ec29e2606c6900091443a1780c8c5ad40c2098105efe27aacf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=is+there+a+find+my+android+app PDF link annotation
    • http://dblbtech.com/userfiles/file/95252338979.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/4841898613.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/83498040315.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/zolikefesoxetimanimuneg.pdfIn PDF document text
    • http://aweibel.com/Photo/file/misil.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/54150821167.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/bafedugukidex.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/65161910084.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613765ea23b98---rizametoze.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b409510df8c5e2bfbc71ca742c1d8d16/fasopiru.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909051757.pdfIn PDF document text
    • https://bloomeng.com/uploads/wovezisasavonuw.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210906104421.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///86406590314.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/wozatexodovazazujigirobor.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/5257957525.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04d7ff7a---fisuxudovibenovinewutelik.pdfIn PDF document text
    • https://icbacademy.com/upload/files/sofetagaxexisaxidapaz.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/japiwejopajejobepon.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18749596756.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kilurarogu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/22282236913.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3de96cdc2a63ced7cb31a480bc195cc3/zelamado.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/7623944685.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10780 bytes
SHA-256: ce4c26f4b663b59f438fa8a098e05d61032091822b8ff5d54394d9140b0a68a0
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 17672 bytes
SHA-256: abf920c27bc5e9a36fd249a550fbba90f0f21aa525352461796f95a92c3b9952