Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bee4cd483b64cd…

MALICIOUS

PDF

114.5 KB Created: 2021-07-23 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 231bb37306c3cd28691b5ffa3a00a7cd SHA-1: 843bfead9eac89f89b756415561c3e1d63b63dec SHA-256: a2bee4cd483b64cdf117a21fd438e610a067d02b9042b14ac8918adbb8606025
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The presence of embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains, suggests an attempt to redirect users to malicious or phishing content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d74dc356394---gegagexanukadarunovu.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b070f015---dilokogigokawolabumavefaj.pdfIn PDF document text
    • http://candientushinko.com/images/file/lugevesibezo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608900e319679---93322087521.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/kerorugijejuvubexob.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/672916c1e718db4a30724830acf1bb36/zinuxoxexunafixu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef385d87f---48408302896.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/63877204606.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3a5onnrf4mbgenhriop1b4ij5g/90505075166.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5b75v7rtt3ca9ligq8ebodtjuk/lexarabumawenuviregeza.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/92560615314.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/9736562841.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/lufiwuzixirudomo.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/timakibum.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c453eef1---80428783170.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qunoegqijk9h549jp38hh5ichj/jajitazujamegaparumab.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/tazawexekononepajotojisa.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/bowokegir.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/7205674589.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/jenudasuv.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/25930915107.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/vininu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=companies+working+on+environmental+issuesPDF 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_off00015894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15894 10968 bytes
SHA-256: 089598a2689a55ec618eea81eccffc5a1d243f19eb3a1e623477259b3310a234
font_01_sfnt_off00017220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A32 19676 bytes
SHA-256: d8186dc54d6f32fc9095f6ab423688cade80eb22f5794b16da95ffabfb95fc67

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