Malicious PDF — malware analysis report

Static analysis result for SHA-256 5145795cd2f4904b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 03:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb093518a2a672df25095d0188b8838b SHA-1: 9442df6fd50549f39b17a0aa6bdee7196f7e049c SHA-256: 5145795cd2f4904b897929adc063bdf282e161dd57523c3eeb56cd3df3b9a91b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple URLs hosted on potentially compromised CMS platforms, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gizunuxejikexizirogamal.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/1986717422.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/rurebikuxovivoru.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/duwoxejokanoma.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/56060435452.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/lixijirotob.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/32002834167.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wajokabolijolamuvu.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/29852636057.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/62898336074.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/buvajijuzevozisunufadipe.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/josevegofepelebi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wuxitaki.pdfIn PDF document text
    • https://matrixx.lu/images/tugorisaxed.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/jelatoli.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/ribamavojexetuwavuwosa.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lowosapomevufufavuvabikav.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/9209272842.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/65078107188.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/54892784279.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vetofuwobelinefowifiwe.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/befeleku.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94131c21a---28717095666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=codm+garena+apk+only+latestPDF 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 18040 bytes
SHA-256: ca0c48bfbd25000fdbcd2d7ee030933cc8eee0fc19dc3f6323f6f0e103a30c0a
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10880 bytes
SHA-256: 70f7e4a8816062a4f1b19a6ddc5a4043d6f84596873204abe723529c86bafb23
font_02_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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