Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcd0d5062226285…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 497c2b5291462812ab13c92c39d1e2f8 SHA-1: 99ff231856b56a13247390ceaf156ebf438c222b SHA-256: 4bcd0d506222628527fa4615a3359be34909c86c080edb44c61f110ed71968bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection confirms this sample is recognized as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/79203506879.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gusizinadogikijanokokem.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/nivujaf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f79b0ef5b---lofab.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/49627403288.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/pezakilabetizo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/84576675251.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/sesovuguvadumomorawomajis.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/16120289864.pdfIn PDF document text
    • http://lg-palette.com/upload/files/tesozodamimapaxuparaf.pdfIn PDF document text
    • http://kalikraft.com/images/file/vawuzedasejazutopudiruf.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kadiwesuvigojipomunuvoden.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-13/images/files/77440954196.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bcbf2085---6695047378.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/19086986536.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nivapinuzuxab.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d72b1ac8---77821254653.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/puxanafufe.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/76451172518.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/gorixo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mevotijofosarolifikinexo.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+install+apps+to+sd+card+without+android+rootingPDF 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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10840 bytes
SHA-256: 1eff5e5a8766d2291e77ab699e076becac4c984de4e6aa1db9dd973f0fb2a6cd
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 17572 bytes
SHA-256: 55dcaf224fd34684c440415c1efc31f4b93070d745b73bbbfcb552ad78f3f469

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