Malicious PDF — malware analysis report

Static analysis result for SHA-256 d975ed4ce6874d31…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 05:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8522d2dd68d03f48ad230c676146a960 SHA-1: c359473eb7b3b8768b06db640e9088122c137bad SHA-256: d975ed4ce6874d311fcc6cf0c1c7f804e45eb474eed70eed26b55500c7b79359
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple heuristics indicate a malicious intent, including a high ML score and ClamAV detection as a phishing trojan. The document body is unreadable, but the presence of a 'download button' lure and numerous external links, some pointing to compromised WordPress uploads, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the malicious payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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.
  • 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 http://photo-preiss.com/upload_files/files/82944534408.pdf In PDF document text
    • http://hmed.vn/upload/files/77527177787.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/74838852668.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/91921866458.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/mikamofixikuwaxi.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/20741566759.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/90513890015.pdfIn PDF document text
    • http://ccshecea.org/upload/files/23912330474.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08e55ed86---derevusodafasole.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xafuxalefitoboxizufigon.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/78489021009.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/73475291008.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/731roulgcd06rtttragugv76b6/jalitajow.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/31176528303.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/bifodazuwebirisufap.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/74391707276.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tawefevadavamumosakiwo.pdfIn PDF document text
    • http://hejia-ele.net/upload/fivaba.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358d21e0d11---58562771883.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/btdq7ur32m45mvuuf9ip2p6fin/94616386298.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd28c21812---3630317052.pdfIn PDF document text
    • http://rrarental.org/upload/file/45937351218.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/nusefudobopen.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/80800518941.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090516244373499.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/rivevamurofelabokinijitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tenet+movie+english+subtitlesPDF 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_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 19868 bytes
SHA-256: 4af51f2075bf54607ac988594a57001a1be05da8add0a6ad46796f1f2ad08a7c
font_02_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 10564 bytes
SHA-256: 66bfdef6dbb86962644856f6b355dfd9c2177b1d113e99b82835f67a1b490f52

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