Malicious PDF — malware analysis report

Static analysis result for SHA-256 3546c081378b6f11…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 05:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4182d108c158a896c396f74c8898246d SHA-1: ccc6637ad859cc3bbe782b4812ab44fb7c38829e SHA-256: 3546c081378b6f11eeb5738696e75ee158ba1ab9145bbd0eb37499a77e85dcaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=xperia+theme+premium+free+download PDF link annotation
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/88728712611.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/95844492186.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/numiwod.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/43787944911.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/11821720350.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/79310344150.pdfIn PDF document text
    • http://nensi.si/upload/file/88871849740.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ace176254---88672799188.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/losoderoloxuwojad.pdfIn PDF document text
    • https://quizai.com/uploads/files/setobabubafegeja.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed0dc4ff---mazuvaniropevezuzozaxubo.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/29595314932.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109120203155864.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f27a7d07f---53699494980.pdfIn PDF document text
    • http://manu-transport.com/documents/file/gexizeti.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614824d4ab9bf---kurulefakesojowofasatu.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/67008466955.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/fuzotexareze.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/84197744827.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/41794792900.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/43776771800.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/bonasuvi.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/48503491281.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/nufabavolitadefipomexar.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109041732504238.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_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 17200 bytes
SHA-256: 337cb6cc0d35377350dd899d492495dcb24223449627d6504432d52b600cca5c
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10788 bytes
SHA-256: 17d10d60d1e18900b52a2c07c1cefb565037784d54f796470b7593bd81d6c040

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