Malicious PDF — malware analysis report

Static analysis result for SHA-256 d046d745eea29393…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 08:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9ee72f40c812082bd037fb76fb92f26 SHA-1: 5f81a61a97b8903ce6a0109b02cb1eabb76da9d2 SHA-256: d046d745eea29393d4fca9cecbb7cf5d74234563d2c32f7c88fa0d58333a203a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=zynga+poker+mod+apk+latest+version PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jj7dfl5bo2onj8lbm21jk741hu/bubes.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/dazile.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/88998270581.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/82604062259.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/10357890331.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kixopozazugiwig.pdfIn PDF document text
    • https://interconformity.ro/images/file/belodo.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/pufinumisubegososesukade.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d25bb1580c.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613325007bdfd---80217895263.pdfIn PDF document text
    • http://afro-safari.com/upload/files/39731153531.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wisilefufofasu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1f911a92---rozekivodo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b332798305---40815463543.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/86252578273.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/biwumakulobaj.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/14347344654.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134254b51b7e---46344276976.pdfIn PDF document text
    • http://charontrade.hu/data/file/35297562635.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210906092749.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_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10968 bytes
SHA-256: 8e5385b9df1efb717df4dd03936a5f672f64df10d9a1671ca5d266b3d072bd8d
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 19144 bytes
SHA-256: 59e3a24eec4be00c76dd2fcf1ccd66b336d8fb281cf651a7b02722997083cc95