Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34803f70cae6769…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 00:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbb7493bdfc8841a4b1df3cb4e9f9345 SHA-1: 1520f1345c664efef51fb5c3c2477e23e9cce5e2 SHA-256: d34803f70cae6769bcf227fa85ba9916d79cdd59d78b8023feb688db43b7a35e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=manuales+cto+2017+pdf PDF link annotation
    • https://raiporjai.com/piceditor/file/bibuxavi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1413443a---japuwe.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/ximararakeguwideleselajek.pdfIn PDF document text
    • https://maria-galland.ru/files/file/sibapipewolofurinir.pdfIn PDF document text
    • https://denimder.org/resimler/files/laxilufevejiduwoji.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109091907331828.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nedafasodunikuta.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f057bcdd67---66799221565.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/46935235918.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109071959202379.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/bebepiravukiroguvaje.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/mamakikebudiz.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/56963693499.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161403f747e49a---17971510123.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pikupatapabaferen.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/98848076852.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50177316221.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/38395890502.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/murulogaraj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ba35745b---75487425608.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/lotanegu.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 10856 bytes
SHA-256: 5514d1cf114ff48fecf51b496dfcd5dd00ba04ef90465488970d2d5a62777305
font_01_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 19212 bytes
SHA-256: 3388f9afc2b076d07c1ba5eb595bd31b291565d54e2a8a30dabe92e9a393ada1

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