Malicious PDF — malware analysis report

Static analysis result for SHA-256 66340af643643973…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 03:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb243e7ad99522a7ab03f738930bd908 SHA-1: ba7c4a415b976ef67abb3c94a996d5ea85ac4a08 SHA-256: 66340af643643973f2e3e2b464b5e738f8385e78ca7b2f3f460d6bf390db7654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and links to compromised WordPress upload storage, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=instagram+reels+download+from+private+account PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613425c2989a5---sokukewonozonusawa.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/83170408968.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/83502009584.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/55078801391.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vejid.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bapafokujotepovifakigoni.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1669384452.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1dd687ed71c33bf8bc27db225157bbc4/27909903824.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/ziselufaronif.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd213d13c0---zonofifuwirukubigumufes.pdfIn PDF document text
    • https://sentralperdana.com/file/95889680366.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/33410316196.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/66420813031.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gubibopezi.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/kugigozukabezadugumomu.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/sajobemotepaf.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/ririzivov.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zafujeko.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jtr49uvgkmt3eh4icl51edqev3/laxorifatumin.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dudos.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141138db91fc---butikanuvazamezirijexaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411d24416d1---xekononik.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b656d087f---zuserimijawede.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n4jlsulefhj9ocptf5v2qhv450/50994149867.pdfIn PDF document text
    • http://www.celso.org/download/10952701314.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_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 11164 bytes
SHA-256: dd404ebfc87782d0c051d17a0d55883a8098d16e9b0da368f7e5cba29d70a8fa
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16228 bytes
SHA-256: 948af63e10e29a05bb6398a6b690cffab18a14486cd284983fb4927e11531da2

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