Malicious PDF — malware analysis report

Static analysis result for SHA-256 49acde80e360c478…

MALICIOUS

PDF

106.0 KB Created: 2021-09-07 01:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df3c4224bbef54dfdbf864a0a8f2b9b4 SHA-1: 8ea5f10a4952fb04e5f7720a71ae17d977e0301b SHA-256: 49acde80e360c4785dc5e271472851e3be7878c200e2be49bd9e5b640125d81a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=manuale+istorie+admitere+academia+de+politie PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/85jt5c5j4gpdbtcshmb1mopnvs/58439727843.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qajntthpjui2gcugmj3f5219dn/17151172496.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63e9ec92f---setoluse.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610522c21c173---kazuvemijot.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/589fa33faa536b1ffe256235b173fb43/67400386960.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kuzibefipevijoruwixu.pdfIn PDF document text
    • http://maihiendanang.com/uploads/image/files/37611514295.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wikuxanelikuwufi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6803a4fa---mekopikemuwimupopumero.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/atte25s24ets0u5ved5hvkfdq0/mevazibidopaj.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2912cb89f6---12085188524.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430235604232708.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7m65ouiumf6pin76drvj1d83ul/6687115641.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/6732374273.pdfIn PDF document text
    • http://dzbnf.com/upload/file///kanadisudegojo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994e7db444---24539824201.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60a1406412---54658855776.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021063005570985.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1eb4b42436e078f46602525fde7a7407/nizerupedavazumemedot.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/foguviwuge.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c757e323f---86341436330.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/31415604003.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/pugilavadapipefu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/87m3kdp6gf99be6adbcsofm6ck/92593395763.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_off00013d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 17252 bytes
SHA-256: 5ecd465c38e78f57ce43c6543d28a08d29748a9a914a15c824602ddc9f0fc749
font_02_sfnt_off000181b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B4 10768 bytes
SHA-256: 776eaa08843310b9a12cd61f5070f0cc413aadd1a85059e5466f1e502b2b15be

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