Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21ced8b95d2eb0…

MALICIOUS

PDF

91.5 KB Created: 2021-09-23 00:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de7fe6adafabfa2a63e5f9922e8352e9 SHA-1: 1f96051f2d96fef63f2eb8ec2dca18acc5e1e240 SHA-256: fc21ced8b95d2eb025b2c6b333805e652f1d46a707c496cb0d6dba1ec0343720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://kondicionery-himki.ru/upload_picture/file/29903323915.pdf In PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/87937315660.pdfIn PDF document text
    • https://tivicom.vn/upload/files/45379884955.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kokajuratizimek.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/bawanerosanime.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/83918232658.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/92833126280.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210923010508.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/dazutipevolipudef.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/19207997457.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109230554123186.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ff97eccede9b37f0eb6efc97363d2ff0/43883559086.pdfIn PDF document text
    • http://spharma.ua/files/file/xibabamugajizobusarapixej.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/kowesosikokanixivuxukoso.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143438cef039---41372503338.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/wipowasadaxuxekizoruwuzo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021920923355315.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109160630529467.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1905d1dc9710c7f7b29be4326bf42f17/vifisanagekefinexeguruvaf.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/molilujokized.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/27353889986.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613951f7cbc9b---gagagafopor.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/liwufipixowagi.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/gizimofarefogixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+cast+your+phone+screen+to+your+tvPDF 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_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10688 bytes
SHA-256: 4686612188f9564a05940c0fe77f6e636aaf4e79ac508127ff12973a8f63dd6f
font_01_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 17228 bytes
SHA-256: b948281f0c2247fdcf67d70696615b54d8274462807843630be4cafd6b82fa18
font_02_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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