Malicious PDF — malware analysis report

Static analysis result for SHA-256 5341d8f4b2aa29f3…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 19:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 85e690c4edebcaf664c2adc3a3cfc885 SHA-1: 523b8e9454b0e4910d1d888ccfec1b305aef92e2 SHA-256: 5341d8f4b2aa29f3b049e4f8445d6567f916963f1570f9a4a92ff0993e7b9dd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV detection and ML classification further support its malicious nature. The presence of a 'download' button lure suggests an attempt to trick the user into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0ea896df---xetogisas.pdf In PDF document text
    • https://littlelightnepal.org/userfiles/file/zejibibuxeviwezovega.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/82266669235.pdfIn PDF document text
    • https://sanidom.pl/img/file/wesuzowa.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/nakokobesupugoxutumesigaw.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zipetenurejeluw.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/s74rotoptd307lfnj3es5on0gu/81653336105.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/65595377873.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/753cfa7b19a92294997475c4cfc04392/89088295454.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9mffjgvm6ajq1io6l7e87m90n4/18711999579.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/108904dc1dc2181e2b10cebcb4007b2b/birifirusuzogexipagexifoj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083390084ddb---linadabuw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5211e6478---dejid.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75277405487.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/51945500030.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/18246273220.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/24272581bdc7c2b842f9f9ec024c541e/75813391601.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4d15a744---vasidaxekido.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/wekinukilezaloz.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ebe9bc09---jovajaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+a+margin+in+wordPDF 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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10320 bytes
SHA-256: 8828f89290040fca414d384bffb84d4f1b059ab79f0d1602ecd2722ffc8ac1c2
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 17116 bytes
SHA-256: d6db5f77ad759a250235bcd894db78a5dfc8e793393b74ada4cfa740423f4d29