Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62ed5c68faf058b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 13:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c0d229f42a2ff6c162dc7d0c2716bb7 SHA-1: 941c5aa193c798cf9924c826056e358c06680cd7 SHA-256: e62ed5c68faf058b7014479612aac6ca6c3084ef5a17b7350c52653948e0dca2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF structure are consistent with a phishing lure designed to trick users into downloading further malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vendsol.com/userfiles/file/38191224887.pdf In PDF document text
    • http://acsalma.hu/userfiles/files/90058058755.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/80684241859.pdfIn PDF document text
    • http://unseretochter.ch/images/file/21914223743.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/taforegub.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/femabibotifu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • https://shunnasato.com/fejirafinanuxojagagapu.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/nexok.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9b8ccc9d---tuzomikur.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/banepozosupatewobabo.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gogig.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/3677022065.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/50620812c8a5b97329e2dfcd812626b7/13690909355.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_212000.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/buderijusezoxer.pdfIn PDF document text
    • https://qnzar.com/files/77622763845.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/fijotinal.pdfIn PDF document text
    • http://jar-ted.pl/file/gowabafopug.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xasoxoxadubo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/46029290084.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/lemevet.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5097c15eac2b2d36ae349d95f815f486/loguxeviwuzefirav.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e715a08af---43461232558.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/79048231322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=taxi+sim+2016+download+play+storePDF 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 16940 bytes
SHA-256: 39c85b4dcfbc818084bace3a08837f527abe26ef4bdfd019f8c99f22daecd9ad
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 11280 bytes
SHA-256: 88b43d229e69661f3a6ae94b3b13b71133a38a37256255181a79c8460aa01170
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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