Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6627c3239f83dc3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 981c11e9b94a7680ef896476eda0a9af SHA-1: ebde4e30a5ac90b7fe068c49f6bef6d2c8f6f7b7 SHA-256: b6627c3239f83dc30376839a2a5dd6ebdebf061895bc771439e440fecc5743a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress sites, a common technique for phishing or distributing further malware. The PDF document body is heavily obfuscated and unreadable, suggesting it's designed to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de533c0cb8---49404267.pdf In PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/nixigadataxekawidino.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c260802c44---83823275686.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/22967387436.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d48b3189---zuxalomoruxexatubolojo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077a08116c0e---35054876747.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09707281ee11a6baafc2d82e071c8b0f/58747671943.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/27574136655.pdfIn PDF document text
    • http://btfa.tw/upload/files/87161652523.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/rigexapixobonopitidiregi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a5d113002---beruvelikabevaxada.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a3a91e026---wexuzekulubusux.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/22fa7f65e4f4523a14b87017bd4c7466/nupuwisaxi.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/82509518445.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be64d0a1502---gobetadiwejon.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rdsnk6h3u70ob4dqeehi9ktoq1/52301697889.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vebizewi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/79425815169.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/64187308510.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/logotasi.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/xolalefanewidejanimunis.pdfIn PDF document text
    • http://fourfoods.com/images/files/wonisute.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/48866358659.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/9168132157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ias+32+pdf+francaisPDF 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 18392 bytes
SHA-256: b0a4a7a86df8f2e9fc886de6f6fd8687998d2376710f17712f7434ef9e663915
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10460 bytes
SHA-256: 341db97315a6ebf50aaedb4d5e7b5ce8bc324d68877fe89907dbf9a40dd79601
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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