Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd73fcc588215457…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 01:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 016d0bac8d433476ab134fef35727470 SHA-1: 2ef97322ef7314e813fdfa9e51358c9049e1454d SHA-256: fd73fcc5882154578c5a7a4ad3ac191d9ce9aebc577d04b2f8d824d451f3f70b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and multiple external links, some pointing to IP addresses and compromised CMS uploads, suggesting an attempt to redirect users to malicious content or download further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links indicate a likely phishing or malware distribution attempt, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://varida-tech.com/ckfinder/userfiles/files/22574096087.pdf In PDF document text
    • http://geo-equipe.it/userfiles/files/87031708432.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bukofesabinol.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jujawafowu.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/vevazabupapopivupojivexaw.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/gojitiluxef.pdfIn PDF document text
    • http://rcot.by/pics/files/10318799617.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/werijogekuraxedivig.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/92032555014.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf051a7bd---baluku.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/bufakapage.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eda76607e---sevemozovi.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/70754984166.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210918055608424.pdfIn PDF document text
    • http://samtle.net/ckupload/files/25863671480.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/fevuguxu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tolumonabazujobupotafakex.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/68612074868.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/94935327440.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/gotupow.pdfPDF link annotation
    • http://eraldocomo.it/userfiles/files/pazowefadiluxafobapub.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/71253543374.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d84c41c3be7f675d0eafd34e40ef085f/51153520822.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/vuxawijaxavazorevakimixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+mod+in+app+purchasePDF 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_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 17532 bytes
SHA-256: eed4ed2446e9eb6a373aa8adc2e09482cb30fed06ad5ea46e6e6bba7dd4590ba
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10912 bytes
SHA-256: 639f8d17413f2a85c6360c1263069b526fc0f700cd21bc1ffa20cebca7d09398

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