Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76e3e956d5b1b8e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 07:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f6a129ad3e87ee93dc5b0785fe03f48 SHA-1: a5ceac195c2a3f4cbaa84c22adf6663cbb37b81e SHA-256: a76e3e956d5b1b8e04c4d25e26925dbea53ffd2d9dd24d4d5b08dc83f3390607
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a large number of external URLs, including those hosted on compromised CMS uploads and disposable domains, strongly indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely serves to redirect users to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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://ketchas.ru/uplcv?utm_term=clash+royale+hack+generator PDF link annotation
    • https://nergizleryapi.com/image/files/tufipixolak.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/94788410484.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ec790aca---zodesebiw.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/novezezezef.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3528634f70c0a08459b58687022ac836/tupev.pdfIn PDF document text
    • http://plncse.hu/php_data/file/tefapal.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452aeaecc5d---gegubevofebi.pdfIn PDF document text
    • https://stauber.lt/images/files/17125536705.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/66131464568.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/68497621516.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/25192091671.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/femitanozozaveme.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/82727341494.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/jajijakitevabedug.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ca5cf351---wizakopumovukovuludulu.pdfIn PDF document text
    • http://status.cz/UserFiles/File/4183223067.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d047b4d23f---75441367172.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/3027630612.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/paferigiza.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/jimadogonunixivigu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/30499710309.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/mamakikebudiz.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6135f844b6f94.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/44512827711.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/63743266730.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/rijozoleje.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/xorop.pdfIn PDF document text
    • 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_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 18336 bytes
SHA-256: d4bcb885ca6155a46b930a3b8d80a271e80dff0ea35b13775fdfffbf1af60192
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 10656 bytes
SHA-256: 9f2bf268e4298312e8784b92e4876e9f56217dcbdd45732c09a24b521600fdff

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