Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc7d87e5240614…

MALICIOUS

PDF

87.8 KB Created: 2021-10-13 15:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3a4922814d24c27264a912473e1e6ea SHA-1: 0340591422659624e86839605c364b451b409d9e SHA-256: 0afc7d87e5240614b62e503b1742d592141bddf42d45a91834be761f030a3da9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the sample features a link farm pointing to multiple PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ef46f3ea---50002347479.pdf In PDF document text
    • http://hyunshin.net/userfiles/file/54139253363.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/82048227779.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/nekalesuxurigewomajolaza.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/tilobijobanobidofodupoz.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kotosawadisobulolulabo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pavowugubopibomexigin.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/39862691533.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/bibiselofasosamiba.pdfIn PDF document text
    • https://cowik.pl/upload/xugezubetaradod.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149483c9ca8a---lekob.pdfIn PDF document text
    • https://arerp.kr/data/file///pipox.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/93850837343.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/joranatan.pdfIn PDF document text
    • https://salwangurugram.com/files/16321786289.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/21621402944.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/75220048688.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/wemejigumizen.pdfIn PDF document text
    • https://afma.pt/site/upload/file/wikuwaverorakatokinaga.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/10761882387.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1ccab382167690cdb13887d40bb3d4a0/bujadunekozud.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/gafobugorubut.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161635fd419671---dipitatugikevumaputogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=play+cards+against+friends+onlinePDF 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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 20372 bytes
SHA-256: 1769e5cc5c483579593b512b5c900f7cd8e7dc627a0a4d3ec579353cee712309
font_01_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 10764 bytes
SHA-256: 4d26bb67e778a38bfe114ec45aa769f4a812b73cd2816cc881c036bf5932746b
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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