Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff95fb5f29abce9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b35eae40194379fc6464d82dbdaa4369 SHA-1: 407bb477a1b9ae5302a12e438bd62594cf92ca2a SHA-256: 3ff95fb5f29abce97c99c86cfd76073cfc137d6352d78a1f22a4dd071fa363c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=inspected+meaning+in+tamil PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609510d19c859---zamazezetibegidow.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fede281fc---84301659142.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db559a6fe---12027863946.pdfIn PDF document text
    • http://artospace.com/pics/file/5368794062.pdfIn PDF document text
    • http://maihome.hu/admin1/file/90453102000.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b4dc626380c5869bd9b5253f96c9f65d/98624822583.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/tafep.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hfuk98tqk4t4nq65cnn340ls85/vepavix.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/susoxofonu.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/92028341234.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kasujiripibatopezugurezi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/buxusotegedejov.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/9028369738.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e2b938d8768276c162918d968d664d0d/penoziwujexokutidiwudepa.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/nenosogaloso.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5bbd70d25---runetevaxisonoligarefux.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/jegojinibomusizosamona.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/17776394185.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/zubotesoxenavo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88c9380d8c8bdc4afbf1c11dfd35de50/71822936039.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/80532431248.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/fowajoxi.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a3039ac3d---kitoku.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/86697666112.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 10588 bytes
SHA-256: cbca5ae84b80f6b9608fa6e337afaa2a6bffc70fddb42dec5dc50c308f65f855
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 17908 bytes
SHA-256: 6652117dd820b317e7fa9e6cc9ddae9148ccc47da695540e22054abfb9a6c1e0

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