Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57af0f12a6dd13…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 16:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10a3892e4929a2026eb61409a8aeb17e SHA-1: 4e6a0bc68a4836ea8b800c6b057a480ebd306534 SHA-256: dc57af0f12a6dd137908ec49aff9de2472d4b11dde772b71c6b508944405ff20
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO poisoning. The presence of a 'download button' heuristic further suggests a lure to download malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://krisoc.ru/uplcv?utm_term=android+to+iphone+photos PDF link annotation
    • https://hainutedecopii.eu/ckfinder/userfiles/files/ruvud.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/74157872412.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6701b21ded76ef1e34df2bca7afb7d05/gosanot.pdfIn PDF document text
    • http://uhorder.com/upload/files/putugixigejore.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/vakifufefavopibetame.pdfIn PDF document text
    • https://estoniapools.com/contents/files/furagopudur.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tevolizidafukaduf.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b106d9e931---rafufetopuvojokopevejuxuv.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfe7eaa3c---32385103100.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/deman.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a93ef3cae2c2a6753816ad363430ab15/24102750757.pdfIn PDF document text
    • https://labelmarket.pl/data/file/pejaperakewapedopuximoxog.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/loxibekupumamolufexov.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xidivaraj.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/83691006052.pdfIn PDF document text
    • http://susutour.com/userfile/file/liditirunepuwubutupi.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46681523615.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/40742623293.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/65204165839.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/lugatubewedetirisavetesat.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/99305035355.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/litidilizakufu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/95172250264.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/27184212211.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/4126373473.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/mepawodukebulegato.pdfIn PDF document text
    • 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 17404 bytes
SHA-256: e03f5ca7264454392c9d23355b10217bc0d56b31c60fcb9ffde52cf13b5dbcd4
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10260 bytes
SHA-256: 0e7eb40a66bbaeed149ef2c4ab026336bbdf044049866076bfe69553bf69707b

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