Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f8a4884dcd9d0d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 10:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b268d7be7dc7435311531218de5e0ff7 SHA-1: ce023019ca934711d03628cf39f09d3227162148 SHA-256: b5f8a4884dcd9d0d544b214ec573a9316c98a2b08f28113a267c2490c9a4e136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

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 http://zhouzhuanx.com/v15/Upload/file/2021913348149255.pdf In PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/30072457681.pdfIn PDF document text
    • https://ismart99.net/upload/files/98041740671.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ec85c04760695228dceb9423576d7c79/31775327230.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f302b59165cc3e1cd9d27269a9fe8f4f/pekopuwax.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f38976eacf22f53b6cefcf3d09b185e7/vubenijaxubodi.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/30215007941.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/rakikapunabomerijesidob.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/dosafi.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/fodabaxizogumez.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/molananepatudidede.pdfIn PDF document text
    • http://normel.org/files/upload/file/vikevigotosona.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/91839114206.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/puxirowuwewafamelenariviz.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/70154105465.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/72770006027.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/53885089149.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/58167609185.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasimakenomafuzirijidevuz.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nosofadedipopelupire.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/36401198805.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613773784eef1---dinudamikomonirafijuso.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/25499032332.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/98744710019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=send+android+apps+from+pc+to+phonePDF 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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 18040 bytes
SHA-256: 1409e7c0972a21912fca6d741b3da60278b2b0ed246a7622c1e2fd107642fb1e
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10912 bytes
SHA-256: 41739b6d90816adc069bf56c1ae84079937164530df3f1b574559e1318873eac

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