Malicious PDF — malware analysis report

Static analysis result for SHA-256 65618899b7237648…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 20:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a08dc12b87b20135efd7ac3b0795b33 SHA-1: 5eb01b4719f5f8f3f35812a4f6d3b131b0f70ea6 SHA-256: 65618899b7237648946a9638c0064ac9d922d48fa374e7f05d47c318dcc9942d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence T1059.007 is included. The presence of external URIs and compromised upload links suggests a phishing or malicious redirection scheme, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130217f406e5---94918790581.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pagqeijbuit7cvslu7cqq8nddm/80324743675.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/zevutowufirid.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/zuwise.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/powisasixad.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/65956649773.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rawofona.pdfIn PDF document text
    • http://reopen911.info/media/file/poguzulepav.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/mejidatodepujifopojitil.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/38496346175.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/63476063156.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/3675740972.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/6170547740.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b209b8d3---xuvomafir.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/10714801210.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/38803891795.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/5452260601.pdfIn PDF document text
    • http://eternoohydro.com/d/files/20865620705.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/85721358170.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/53551529421.pdfIn PDF document text
    • http://jump360.co/upload/files/20210915143739.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/98555700766.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/25250723512.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/71115955236.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/78733126102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=5+trillion+in+numbersPDF 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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 18408 bytes
SHA-256: 4dc2709068959e47101ff29ce1c4b0499b564de6dd72c27fe94014029d732384
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10384 bytes
SHA-256: 7a9a5ef1f765936646764b000bc6268feaf442f94bc3cc692097c9744b3f8785