Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd5ac6b3f005210…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3621a30e879a7bb20f7b57404a82f073 SHA-1: a57fefb2a7622fdb6c151aa2faa7b27f32615e8a SHA-256: ffd5ac6b3f00521010a27ae3360ff44821918f263755c61d5f515663f4454884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of URLs like 'https://cructi.ru/uplcv?utm_term=download+chrome+for+tablet' indicates a lure to download potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=download+chrome+for+tablet PDF link annotation
    • http://kovofilm.cz/userfiles/file/603878199.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zurerefurigapipizegak.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_1E30F2E464AEA547.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kidin.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132fea8a43c3---21117966827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc118c80de---32291081370.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/simesomojikefupe.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/diwepitok.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/juxitovodokoluwasosilod.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/majabifexilasixugepi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/sedibimikusamojufafu.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/wonuvuwelopavovuk.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/nulujedalidupalasozus.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/fimapesakaze.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30013270dad90e489bed3ca52d9d0892/pininizisudom.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210909092322_92g37t.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/polodolawu.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/pipusepujademezubifasus.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/gezijonogugoxujixol.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vetifonopurubejitanula.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/diduwaja.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4476a96fc85e0f59e8ba7b7b7949db18/kevobim.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kefezoxaxizuwijejelob.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/satibiragavobido.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/nawitumipes.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10708 bytes
SHA-256: 97f481673eec8a74e5300e64f382f15051c7e5a74b85d55fb98031a3627fd998
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16524 bytes
SHA-256: 415b5042888329e1a87090ddf5b81cca3e91cb9b86c2352681089db52bab3522
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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