Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c42e7a1bb69a454…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 06:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c4daf02daca56e0f8581bf28f950bcb SHA-1: 7cd4ef1eb4d185687441dc6b24274e59f7157591 SHA-256: 0c42e7a1bb69a4542fba479f36a609c500391f417b8ea39c254f06d9efae3aa7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/71133cbd35fd1bd15c8a8b4cf533473f/72277301428.pdf In PDF document text
    • https://invest.pl/userfiles/file/janasotafixasaze.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/vuzep.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/63590721949.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/zawowuneje.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b97f1041ba97685f02f93236f3200f78/8786297526.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea9fe9cca---66241926498.pdfIn PDF document text
    • http://classtool.info/upload/files/60564787998.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/79df2bc7ee8e2360c58cba33ac597472/62465678569.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/rvmvnt85l8a2nnbb7volgj690f/lokije.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/43313928513.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/41068540755.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/40037942412.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/82115257368.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160773139bab84---97724361032.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/geruzagasifugulorazelesev.pdfIn PDF document text
    • https://kawanmto.net/contents//files/27375383430.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/welofufowodet.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2072acdda20db7c3407bf55cc53575b4/gewerewez.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vilotukarasomuguwulesu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e28c8ba23---savigeja.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/977fsk6b1deke31ji2tscbvhdo/bofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=japji+sahib+in+punjabi+free+download+pdfPDF 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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10944 bytes
SHA-256: c5f7459e80fa97c5ba34871db64a7a9123c6a30510c380d55dbff5a271f67122
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 20264 bytes
SHA-256: 37e1ab039892250de2e08a015f7b0e9843c0b487e79b2e12ac4c1edfdc8f9c67

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