Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6581d287c9edf2e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 15:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db8d3a6ee99b0022abf94b71c0726c49 SHA-1: 380fae996082816c3ae35e9dd4da88fe43b2cd09 SHA-256: a6581d287c9edf2e69370e0c6ee4a1e2f731948ecb22aeb44a128d639f5829b2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and is structured as an image-only document designed to lure users into clicking a link. The heuristics indicate it's a phishing attempt, likely leading to a malicious download or further compromise. The embedded JavaScript and numerous external links to potentially compromised CMS uploads suggest an attempt to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 0 text block(s), carries a click-outward action, and is only 67 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eqt6lk547h9ga02nq2rn1k2fik/98348498654.pdf In PDF document text
    • https://m-isc.com/userfiles/file/nilizorugavovedifonoz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e12b7c794---tixivanune.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38587579458.pdfIn PDF document text
    • http://maihome.hu/admin1/file/67120952180.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/tagugevipuwij.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133718f49412---wubibukewasavetitotitok.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff6fb8eca0b2d0ffe8aa999befcd5fe8/18481895843.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/miparobotenelebarunedonab.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zonujiwasu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/90151762206.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/20581709029.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vuxepo.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210922205227.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/jekigiginibudirutoxajop.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/13489218788.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11044637731.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/5660723130.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jamev.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/feremoduxaxoteka.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xunikififamuridogekejezu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobotoxulopapukosinanun.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/51505522551.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/duwoxonowixavipagipujiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=f+major+chord+diagramPDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 14312 bytes
SHA-256: 19f776f294ed662e15bdc9dad4636ac618227060992f58f1b7e30842bce0e641
font_02_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10376 bytes
SHA-256: 812369fa09d06a28397b40e4274b54ce7cdd3f755f5ee76b90728834ecc682dc

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