Malicious PDF — malware analysis report

Static analysis result for SHA-256 6893e39b98e91b38…

MALICIOUS

PDF

75.7 KB Created: 2021-09-11 13:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f68af3cf642ba40abd102dfb9cc107c8 SHA-1: 31ce6fa6b3a31f2bf73efdc4d9e0115f6ec2c554 SHA-256: 6893e39b98e91b3852da3deb0a6b6f3b458e3b0545c3ae856cd91c10be9800b6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage, suggesting it's used for phishing or malware distribution. The presence of a callback lure further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6103728694.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b28742e---54511535159.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/6942174064.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133554812f6c---figozabufavelezon.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/gubekalowidovafuxesevonak.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/36499611496.pdfIn PDF document text
    • http://konberdbio.com/upload/files/sasagufe.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/42491681912.pdfIn PDF document text
    • https://tigapilar.com/upload/files/99828955464.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/kopabusefapasi.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/94030491190.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/37428740456.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bupikanebavepur.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/34900357320.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/72380949481.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/8663200154.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jaxanejimapeso.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/suvuluwij.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912ecc17e2---39761509256.pdfIn PDF document text
    • http://rafaelokazakov.com/file/59074244288.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/10653001559.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/maberibezemorupeviwuzex.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb82919a9---mavuviwotez.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wevat.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/namidisex.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/fosoxopiwaretajazavuvaxu.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zutuworudodagavogogag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+spinach+the+best+vegetablePDF 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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 18264 bytes
SHA-256: 8a0579ff70b52265c7f3fe60ea2cc4d6a256c87be12b389545da3caba20e7ac8
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10592 bytes
SHA-256: 8ec1db185d333d4e5742222d1333f248a33c7ce05dae077b76b5a543fb06c335
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1