Malicious PDF — malware analysis report

Static analysis result for SHA-256 1809b6146d9bb8f2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 527ef0d73d458c928693d4f15d2941c5 SHA-1: 980c3172175d9ec0072f13cc5bfcebdbe167f12a SHA-256: 1809b6146d9bb8f297a7f2b49bbbbfeb0f700e344e996f410668f6146edf2fcc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://divodizain.ru/ckfinder/userfiles/files/rokup.pdf In PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/11287312825.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/75222369169.pdfIn PDF document text
    • http://gotween.com/userfiles/file///maxuvokivasidaxige.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0iqj4a0o8dqt6gq94er7uc8nmg/kigamo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f948f7c39d89a7d9c7ce449fc5bebea4/zetujojofotinojinid.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/48182439230.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/87896507812.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/99086951949.pdfIn PDF document text
    • http://elitvorota.ru/f/file/28432360740.pdfIn PDF document text
    • https://incasur.org/temp//files/99485956938.pdfIn PDF document text
    • https://airshow-bg.com/file/10717547385.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ac10bee260ae1f1c21d6fca68366306a/65469923104.pdfIn PDF document text
    • http://alvitraders.com/files/mogufutufanuv.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/74178253618.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c101aae0---domesasili.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ada02ildtb1k559ok7gj10v2mb/mezokinutuw.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/nesajaxi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/95edb0d4d11f98aaade89f0118a5deb5/jakivepebipowimaxelub.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/moguxowirawi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wovapuguparofunafimetor.pdfIn PDF document text
    • http://charontrade.hu/data/file/30622470851.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7d35ef1628cc9d1a551c618f2d485b68/zupog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=organelles+in+eukaryotic+cells+pdfPDF 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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 11128 bytes
SHA-256: cc50756721bb6b45d1423df49f074469e60449a52e38531d7b887f941b8a59b3
font_01_sfnt_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 15216 bytes
SHA-256: c105c99e104c98a3ba38539bed4f212eab82698da8d40662674ae569f1740673
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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