Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf68f28d8c3b60f6…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 14:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 562cd2cc7b7e074b9b0c1be68d36d042 SHA-1: 89faa89b5cd3e4a163fe6649ab522665e7f33d51 SHA-256: cf68f28d8c3b60f6d48d2ce33ebd6694af9426cd3ed90e539af13f8f25a1ed1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous distinct hosts and URLs, many hosted on compromised CMS uploads. The document body is unreadable, but the presence of many links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chaitraglaze.com/uploads/ridotadamozaxodisibonuvut.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eaa023e1c80c016372c2e4378d079e3b/40049630859.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/97e717680545ec514cbaf88ed2ce41f8/rovapazeseruvudonedag.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/28110570896.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72cbc2216---82274037811.pdfIn PDF document text
    • http://falerisztika.hu/tmp/temido.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baec80b161b---12305726099.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41tv8rn63bke6iq9tik3l3fn5l/47687196360.pdfIn PDF document text
    • https://primer-spb.ru/files/files/molan.pdfIn PDF document text
    • http://bwc.lt/i/9716822126.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/32452313962.pdfIn PDF document text
    • https://coil.hk/upload/files/nadefoduboxilapisede.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/pobilisumuxox.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8s5rvvbb8lopv9oop629uodia5/97081395255.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb96ea65c70---gumotujirugibovaxosob.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fd8cf7ff73fa211284576ea2010ae99b/desimodifuzo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c775429f---sagenid.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/243fa9ae9943faaa8bb08481c7e089a9/40147820563.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nosuduvizelenaxavolede.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/91996244263.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ecb35e36---56572638700.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ijsnh89828sc4jh9vj1laokkin/tijevugi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ml3bnte85j8l3clkbr31rnici7/94218510736.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/das31jgsde2kipe4fqhfj3t4je/venasikimage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tongue+tie+gas+and+refluxPDF 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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 16564 bytes
SHA-256: df638838b849cbd2911ba0d81ba6455417f57bbde87ac32878eb1b91a9a1d27a
font_01_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 10692 bytes
SHA-256: 75a6260e144dc9bab9d29272d1d8639a241d3b8f37adb1f7f51a6f8c1e11c617

Open this report in the interactive analyzer, or submit your own file for analysis.