Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dad781fb3d04ee7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 15:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61a66464c370eab81ae15e3c37c5cc29 SHA-1: 35a54166a06530b13457e720783f2e86c1dedb21 SHA-256: 1dad781fb3d04ee762fdd39a95b72070a59dbd9c9ad58f867d4619e8b99af2cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=best+rom+for+mi+9 PDF link annotation
    • http://edilgroupdigiovanni.it/userfiles/files/roxizepowodugizowiki.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135735df2e1f---miworijafikejugexuba.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/80217373905.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/76964442082.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/98794666778.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/33883361451.pdfIn PDF document text
    • http://actinq.nl/upload/file/tipexefitujowu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/91886391309.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/simajujunotezatutikidiki.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/26109654131.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/56582167390.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/devuvotejepisadegejosola.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5d36f051---97367202029.pdfIn PDF document text
    • https://somogyplusz.hu/files/savixeruvipobekakofomar.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109060546481910.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/junuxi.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/54919992840.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/12210044358.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/kazajafojudira.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/34557783247.pdfIn PDF document text
    • http://orderkai.com/uploads/files/pelamuwiduwe.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///linugatarexadoxajufewik.pdfIn PDF document text
    • https://raljob.com/userfiles/file/13019691660.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613567e9211d7---69637609586.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///3610357988.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/7662408811.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/vezomowa.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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 10284 bytes
SHA-256: 9c5506d429c44cc76929e8e784718156f3427f87bc633b0f8be129cd731f2fbb
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 17564 bytes
SHA-256: f10b98ef6a196460faf1b8f51be6e8c13191f2b774b8aa113cc1bd4e530d6331
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1