Malicious PDF — malware analysis report

Static analysis result for SHA-256 189685d87a7982b1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 13:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88a916635a9ddbf77e9425b9aeb262c6 SHA-1: e36bff28da8f42f14fe17dbddf1672a59e6eaae4 SHA-256: 189685d87a7982b12407b951b0c853f02c720f761bc6e0d4f3a648ded7c62b9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://classicalgardenfountains.com/uplds/file/papakaxozejukuw.pdf In PDF document text
    • https://makojudo.pl/zdjecia/fck/file/75044811245.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/47636120084.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/82413103171.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/82696484137.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9c901830---86876638056.pdfIn PDF document text
    • http://www.grifin.sk/files/83064257853.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fomokinokenezuxu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/nepikuwiwosetinaguwusado.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/58938830569.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jamakebukefamibewaba.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/mufutazevisenogunala.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3212909611.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/30924052740.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133120be3d92---fomenuzefopilaxuri.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/vubonijivusapelojipamaxo.pdfIn PDF document text
    • http://ailizia.com/userfiles/6872049258.pdfIn PDF document text
    • http://airsoft1.ro/files/file/27463563109.pdfIn PDF document text
    • http://goldmustang.com/files/files/pikedakubeto.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbff3930ff---rusesenijuxuza.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/44744aa4d6c53128c33bf5229fffdf70/89712141997.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vedanujosizasixapetotav.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/zuxororebasurukonezaxoli.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/notimus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352994a07e8---boloponenapota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+play+classical+gas+on+guitarPDF 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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 10708 bytes
SHA-256: a1d3d48a7cbe59906f076bfb51c82e74fcccd90addffa60c237c48692519c754
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 18048 bytes
SHA-256: 9995923e109eab9b3161da86de062c0cdfd741175b2a221d4f9dc3a1bcbaa42a
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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