Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5713fe62cca746e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 429758a7e5e561419cd306c78e53eff8 SHA-1: 4d00438e880ea55323ae54e56d4a4d193615e33f SHA-256: a5713fe62cca746e1772c0c45d9cb178df4c35f9c8e1e89892d66d919fcec7f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to redirect users to malicious sites for credential harvesting or further payload 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://inwebjor.ru/uplcv?utm_term=ap+human+geography+textbook+the+cultural+landscape+10th+edition+pdf PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/loniwuberuvomipaxanekipiz.pdfIn PDF document text
    • http://learningkey.org/userfiles/fokudoveroruf.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/vatotofuvobuposugovo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611305e289f00---75460531747.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/fizaligerabajemu.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/49112669097.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7fb75c7---karurosozamesijovanu.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xuluwinifatagel.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/68546842983.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/97808401092.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/xodejipuwif.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/sojikitababexemojukel.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/56490361784.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/votididoxanatibegolamiso.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7232e49d4f790f85cd705d3590296437/matozujorukim.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/67101822447.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6a797cf1---rexog.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/85365495596.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_off0000beba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 11772 bytes
SHA-256: b5c410d0b394f011756d1e0114dbeaef6819c446dfd8b5b4cc5d49170d06d0e2
font_02_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 17928 bytes
SHA-256: e59cc0047165112e34c088849f037ac8e1de11ca74c544b5bc8016e829d9649b