Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c19a2260c2a8ee…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5c617f392226dfedf6b20b681968864 SHA-1: 0d7b9fe43d8951c9535cabb6d3c76df1ba2b3428 SHA-256: f7c19a2260c2a8eeec868c18c9f961efe6bb44dde7a8e242758bd53a0a5b1526
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://townofwinslowin.com/flash/townofwinslowin.com/file/52563490352.pdf In PDF document text
    • http://epwuae.com/userfiles/file/19609202383.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448219f19b6---lobetusubigigolola.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/53975997303.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/819c8a0388c2f967c8242520dc33f496/jabajokuwizafuwavivudow.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328e715274e---39186921193.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/niwevakuni.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xikawuzineleriwifune.pdfIn PDF document text
    • http://emaaravm.net/upload/files/xalarulujugipetolovas.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/labitisatizefejigarogiz.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/49437165784.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/99824914775.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tozuxopijamarivu.pdfIn PDF document text
    • http://superazs.ru/images/news/file/dizavefazukoladiralukog.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lemiwalulowu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/bixoxijosuketisupexaw.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kutox.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/66598572355.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83431490390.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/jijapigetanepepugexe.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gowibefe.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/xurobaregaduzom.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/32220114290.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e5b8f4a---sizen.pdfIn PDF document text
    • http://scsytech.com/upload/files/17728143257.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/beneguburawiwabobenitoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+watch+online+freePDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/78208492209.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10836 bytes
SHA-256: 102408af0739b3e04c1fa3bcb74452d70ddc641b425c6172d9baa8fd539b00fc
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 18380 bytes
SHA-256: 508b15e85cab9b322c85c4dc5eb4b97293599ec924def10d4fdd279893f5747b