Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555b25d845a13d5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b20048b0e0eea5fae5efee8b1a6f5ffa SHA-1: 06caeb50b598dbee6506ada88c576575dc2455a0 SHA-256: c555b25d845a13d51fab47d1059e364c45aa98a87ffe3dd19efec07f30792117
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure due to its image-only nature and numerous external links. The document contains a high density of links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6dc990ace40a9a7492240fbfc6be935/gufebuwezutafojoxoxi.pdf In PDF document text
    • http://mega-gold.com/userfiles/files/98101599198.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xulapojizapuvomifuzuxem.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415bcf7a65a---94636206482.pdfIn PDF document text
    • https://fultoys.com/userfiles/10052169711.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xexozadifazenizevegunud.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c597e2f0297ced08e46801614309e617/2058585245.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/60446737086.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131580d2aa0e---87151806398.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/sokiguruvuviregufi.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/jovat.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/99711695213.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/60910454817.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/kisag.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/25518131310.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/72795399387.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/71158748089.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/gemakawavapodusadesuxu.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/dawanesenos.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pm040atic8hs9feroq3gclbb57/foruwuvapopimotej.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/14671961459.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/45505231200.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613690933a6ee---xagugagagejegimusizuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=release+date+season+11+walking+deadPDF 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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 10600 bytes
SHA-256: 7d75a787fb7b8f57678dd86f090ed2ddf6f0053e2aa5bb03e4b8a5ca62268448
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 14404 bytes
SHA-256: 21eeedf0dc46cd74ce25be81e92d0fe1f5e30c6a03be21bdf44ac82141331428
font_02_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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