Malicious PDF — malware analysis report

Static analysis result for SHA-256 676847fcedfc63e4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 19:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c64b060c2b9dcbe9437bd74df1f83f2c SHA-1: c8cbb7c6d44674d9b7ad7a8aded6529b7fad434f SHA-256: 676847fcedfc63e4dfb1bd7383f062ada486425bb4a2479d3813f601fc0206ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The PDF's structure and content indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=dolby+atmos+software+for+android PDF link annotation
    • http://bagiez.de/userfiles/file/79101691715.pdfIn PDF document text
    • http://www.bandungmesin.com/file/59843616689.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/29720019825.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fdf5d35321fd251a39d3ae5c43f82ddf/lefazogujixag.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/fipuberixaxidesab.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5k4028di348v786vf49b69jka0/74609721319.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/63211837655.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/46634585160.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/mabafumemurufifixe.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/8211769626.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/vositimafefud.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fikon.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/83195978980.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631302171_1.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/99988411568.pdfIn PDF document text
    • http://elsped.hu/files/file/5731652497.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/di7g5e2aand9us3muccdd35200/tosokobefoti.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/73961028295.pdfIn PDF document text
    • https://ratoempat.com/contents/files/jelufulazixitiwopurufofas.pdfIn PDF document text
    • http://ellev.fr/upload/files/ledibazatexevunifikine.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/tezegupirikafepum.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/93263693250.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/keloxamogijisowuj.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10856 bytes
SHA-256: 20060b472b11fa550a1e6c5b9589a576dd2b7897c8f3ac34414892deee9d3f0c
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 17724 bytes
SHA-256: 823748e8cd8264c3774c32f924d121ad10138b27c9349ff089df85376b17e706