Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4063c48ff33cedf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 08:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4a85bd8abdc08b6c019a7270c0698e9 SHA-1: 2548a24e2bef81e24ba25fbbd933810ee27f2345 SHA-256: e4063c48ff33cedfdd28e43d18889ac400984681c2238427be63a704377da653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://seattleteriyaki3.com/uploads/files/mubobamu.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/volofujejovenodavuwa.pdfIn PDF document text
    • http://www.polni.si/Images/files/jalijakapekodivodalajiwaf.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/vulikiraz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qg4466rrghhh3u3nfamihupjr/tufop.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/taverutaxinofobata.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/97595670983.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/duzojipisirijiw.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/nabufenuwazatowiwage.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/nofopotusalo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613038347c0cb---21862647157.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/91685433853.pdfIn PDF document text
    • http://cabini.it/userfiles/files/70240419504.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/96904082698.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/45067a32f2f3cbf90f7d06ba1dd60f27/91106328122.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/62981247230.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/713129ed53d9abfd662f83ec08908d6f/37964108772.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/lovidivurunugulifun.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/29581625834.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613613676a909---dujipes.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bemedo.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tumuwuri.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/xalemip.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/96482ffcab1c87f3b0866bbcb1adeea0/20037699720.pdfIn PDF document text
    • http://goref.ru/files/file/98126009486.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kodolusu.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/13774977783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+turn+off+trackingPDF 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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10476 bytes
SHA-256: 09cfbbb2dfa88216bbb5653b721bc7497f9cce68881d35bf6977df17b8f8fd68
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 17248 bytes
SHA-256: 6cb5b6c342f74f74ecf81c8436ecf0549ce99c011ee2446a24b031c97385f1d2
font_02_sfnt_off000132df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1