Malicious PDF — malware analysis report

Static analysis result for SHA-256 de620febdeecc800…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 16a4dfd1b2d1073df86f32e9e04a1f2f SHA-1: a03c803c5866e2864d756bbf3b17d51b5e1d7367 SHA-256: de620febdeecc8000e328f8ede539ab2be43c61e3b8ddbe10d4fe18edf508754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7c9ef676---81133801165.pdf In PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/28461779422.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/vomavuvejidajaxewudixip.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/95572283268.pdfIn PDF document text
    • https://aneri12.eu/res/file/45926404843.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oc4af8ud7emld79r15qqpccp4i/23307697995.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/mevulovamemo.pdfIn PDF document text
    • http://cke.hk/userfiles/fudidisuzavosape.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/80091877633.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/vizikurawofotokaruw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450a1865cad---bakajipulugideliwavanu.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/dobudunaxezu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/wuwanilam.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/limokerijegovajiwu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/pitutojanoxulegabeba.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/79598587336.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/96745605140.pdfIn PDF document text
    • http://netart.hu/userfiles/file/7639921164.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210917_44C25BD2998829FE.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/tanifakugasi.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20211001041821.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/lejasasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=use+of+print_r+in+phpPDF link annotation
    • 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_off0000ad45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD45 10288 bytes
SHA-256: 1569376aa823b5bb08a18035870a54118b385a0a9995cd5e4ce2eb7ae98ef81f
font_01_sfnt_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 15612 bytes
SHA-256: 8f861d1edd431a665811d51f170a36944767cb13f20ac99f763d8e81f1b328b0