Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5eb1ac1a8ab347…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5639953bad516e15d5b941f82a0a9306 SHA-1: 13e0a275aa13eebde6dd0414705e22545ad9be93 SHA-256: eb5eb1ac1a8ab347df0705b5e0e97107cd5bcb6e729cf3592a8d7206a2d8c031
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://garantc.ru/userfiles/file/renupeluxeximudute.pdf In PDF document text
    • https://rumusjitu.com/contents/files/rexilidivijagujig.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/34358686738.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/xesikujuzupaseputet.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/49976015552.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202196256463804.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/60615071505.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/85756028588.pdfIn PDF document text
    • http://honghuibio.com/d/files/91578291130.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/29606767663.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3a2q21m95svoi7g970nril7p7l/rokegidujol.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/7419100569.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/paxikusizelimovo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af6281e9f---71343177425.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29cee8c606ac4e1d96e3991dbfb783c8/758041068.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tofuxitilikozagodoponeze.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/likizilegepumivuviw.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zafizipakaf.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/bekuduku.pdfIn PDF document text
    • https://flyags.com/editorResources/file///zasitelopipigezazi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139eeccf1dee---kugumaxaxud.pdfIn PDF document text
    • https://tsegypt.com/file/85368646533.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/zijipotukixokefewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=notification+toolbar+apkPDF 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10380 bytes
SHA-256: 6d5d11ffb80b274eefba4cc6d50db01a4ffb58555f60a4b3b17b534574830fcf
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 18184 bytes
SHA-256: 48d5f84fb03b68d190c97b0e40ae21a6323840abd65fe200d7a46758a9d33d16

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