Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77fa6ce23f5b7b5…

MALICIOUS

PDF

100.4 KB Created: 2021-07-06 14:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: accef07f3b2c340411f1fb43796637f3 SHA-1: 7450443d48448708012d3e07f38d2a55b4b46fe2 SHA-256: e77fa6ce23f5b7b58e15287f1287bbc91f46df1a16ed354ebbfeb602efe33706
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kco.su/userfiles/file/didasobevafojamugazir.pdf In PDF document text
    • http://myphamlulanjina.com/upload/files/25333107292.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c675509aa979fb1a68d0e1fe152a1edf/91282054602.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72866bdb5e---92584228837.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/dibukivisidamodikaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61d6749ee---79078404009.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/18471558317.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8jlip9qflet8rnlrfcko77jc93/divudutemobekubazem.pdfIn PDF document text
    • https://digireg.it/upload/xexinajas.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210524043306_t2lysk.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f72a81548---80264666974.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef616529ce8a2d78e48b8438c474c04e/gozekunukuvigezer.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/62357165679.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/2378141795.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f289084f---84452177242.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/kepemuviwaget.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9qukm5jiscggt5tfnatuphnmid/49070053299.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/tawune.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d533e60dbd---fasuxaxanifetoralid.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/wasemavunebum.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931475cb5bd---92663326679.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9f4e060593104c4fa7f133e70073d1a9/57280680360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=canadian+tourist+visa+processing+timePDF 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_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 17276 bytes
SHA-256: 3e764cd42d7f9725e886367ea7ff915f9576ad6729f4ef9412c8741052412d79
font_01_sfnt_off00015319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B30 11008 bytes
SHA-256: 737652341df74467985634766e00a23ea3656ab1e3a295145122fc296290ee79

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