Malicious PDF — malware analysis report

Static analysis result for SHA-256 f236bd6e54127967…

MALICIOUS

PDF

84.8 KB Created: 2021-08-18 15:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1ead02644d9a17ec4ab9978bd2b9d07 SHA-1: f1b1d3132cabcf1014730caa716dc2aea76b0ecc SHA-256: f236bd6e54127967f38622e0b5e0038aead7123d8b59f1bcdb89787096733f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malware or engage in SEO spam. While no scripts were directly extracted, the nature of the link farm and the detection as a Trojan implies potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://allmedicus.com/userfiles/file/morojujovulifi.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd06e7d10---45425124886.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/wibesufixetowinib.pdfIn PDF document text
    • https://marigabung.com/contents//files/4039914172.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a1d052c98f5d8dce18dbc6709724b64/99202916156.pdfIn PDF document text
    • http://hadt.vn/upload/files/bexobakenufu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/56880777028.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89fc352ea---ralulid.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/28717509026.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/maduporamitagimibizimunu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a738dba79df89c6147f5bada49290169/35586082880.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hdtmbobanog1l1qak302100c1b/2411465984.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/99412566064.pdfIn PDF document text
    • http://ping-property.com/user_img/files/govokuparevunu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/43730947973.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/lapexudigigubevel.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/vikisiravunuzagel.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8g7c4299o83cii39dc5kq505mi/62473842958.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/babozodozagulurix.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e2542ab8---5181152160.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pelizodezinejividexaf.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5f7bcec9---16802522539.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210629182307_hlcg0j.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3f6be6b1---50766665339.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f507b202aac110a27cbfeec40be45c2f/77695037392.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1ce2dbb1---tibozilazewitekapazave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ingersoll+rand+air+compressor+model+2475+manualPDF 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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 11192 bytes
SHA-256: a3c7ea0f282ea5357bed91ad5481770ebb1eab2dd5dfbdbbdd9bc72c3ec35fe7
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 17616 bytes
SHA-256: 992311d6ecedcdc3638204951bb389d85f002736260071c437c48bd50d50950b
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1