Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e57254173d7b8e8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f50e24ccb9d38792e7851d0dc176a266 SHA-1: 768e7345fc95382c71307d5b9b0138ad386dea52 SHA-256: 6e57254173d7b8e8a73642282e983effc2b68a99a13df4b9fa655a6a5220be2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=shan+keyboard+apk PDF link annotation
    • http://puzynowska-kancelaria.com/userfiles/file/92548911261.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/37372562414.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sozozawi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2ba8a79f---26951684177.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/fesobobijigojuxewij.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/16005825215.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210911091800_1483677916.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/mezixafarolabesakita.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/xupikojologikixuri.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/mebisirosit.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/22781220058.pdfIn PDF document text
    • http://tipiland.net/upload/file/gebopazuxorasidaxadonope.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/52559429690.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/82383363587.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c61a674c864926439a473d85b6030b3b/37208341334.pdfIn PDF document text
    • http://att-na.com/upload/23361370403.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e47ef1084e0ae0ab20d430f4cb42ebcd/dodesusudabudi.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/94706114160.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417586cae3b---wuxikenebajobulofo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/natogimeziseseli.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sokojuvixokokadi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59b51b5d1---tikodure.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/zifogixunavu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/vajosazegewefapidoku.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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 10508 bytes
SHA-256: 77c76f1452b9f0f02ceca4d275c3f99e1b5b35e21db446082aebb95148c1856f
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 20848 bytes
SHA-256: c38abdaf485f3d88f46a47dc8ed89382660d73fbde6430b6a12d8482dcd910eb
font_02_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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