Malicious PDF — malware analysis report

Static analysis result for SHA-256 3652de2843f1016a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2495edcb76ef8c0456edd83e86d11af SHA-1: 687379c85dfc6da93cbf8845f4837c5cfb75ae83 SHA-256: 3652de2843f1016a79fa797ab460111dba396072c5b0f8836962629421b2b86e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=kiran+publication+railway+reasoning+book+pdf+in+english PDF link annotation
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/zejajaje.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/sakosivoxifif.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/69280893072.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jaligizugo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9beac910---85708408001.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jezifelisirularaja.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/93391185039.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073766384ec0---paberononadokizoluzexog.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lasisiwituzifagorukifike.pdfIn PDF document text
    • http://wawa757.com/uploads/files/29422015208.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/kalafedudagajonejubebular.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/18144346841.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/17319782112.pdfIn PDF document text
    • http://baptistfriends.org/media/97181850160.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f981ec9a0c---zafokizaxasojawebiga.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5454b9f362220b14c0098accfbbd2c5/43757678778.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/sotosifovoxusiwawipiraxo.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lovusepezomolilab.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507015830_1301139067.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/54804125024.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/tarijudofoma.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/24113744095.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091cac82e1b3---xuwujerajisadamovosub.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/63663066478.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 11420 bytes
SHA-256: 78d561d713f72214727a469934c009125eb9bc11cb3c9ab9150d8788b553e039
font_04_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 18276 bytes
SHA-256: 2975cefdb1c9d47b5625d826babc1436193abf6cf70964dd10debdb58f95a416

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