Malicious PDF — malware analysis report

Static analysis result for SHA-256 2341e634378aa96d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55cff25ac4c65cf2fc134de763557750 SHA-1: 3aee5b5df116dd5c719fe4cef3c85ebeca412d52 SHA-256: 2341e634378aa96d09c3ce7a2514bf2c4dffa0e14e22f6ec81ea7691edd23597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or SEO poisoning attempt. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://clumba-indoor.ru/files/files/88389509195.pdf In PDF document text
    • http://rheumatology.institute/upload/content/file/52244062913.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809cb42e2e8---fobajazesisotejopijoxe.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i2kg35gv1b5s13miput1smg2a1/81843489668.pdfIn PDF document text
    • http://armanetti.com/images/28593688975.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/p0o4r0sgr0oho329rcdfrad96a/15196936490.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/37706671611.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/54459821520.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/lajaririwabus.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/25169698197.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/luvokuvolifageka.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d62878c6---kejuli.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fceec78349---ditebogemo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35122f475---40101232342.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/11351861032.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885ac56a09---jazalojofevalopidu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04d87069a---38809991907.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/taruduvuvofitepod.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b4eca76f---93408844267.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ioe4epqs1ik1v6il959pahob21/21705084993.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jamamilaluzagapuxijuz.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/10488104803.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/16140729098.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/hecibdlaq08gp09n5ts9slbkm3/gepodowapo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210630074209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stress+can+cause+shortness+of+breathPDF 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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 17152 bytes
SHA-256: 361ad4a288d3fdffd3eb5062af2ba2dc0c4d9083040045f53f6589d02155c0a5
font_02_sfnt_off00013a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 10608 bytes
SHA-256: 1181bec12cd1cae5564253e3691040440dd5356389df33a9b2fe94a48ba734fe

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