Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83d27d765b50215…

MALICIOUS

PDF

84.8 KB Created: 2021-07-28 14:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2246b833d0f52d8058c10c79d7c41c24 SHA-1: 69ecbfbe15d2cbe0d54220675603270f7a8c6bd2 SHA-256: e83d27d765b50215fb097f013244b46178a5fc2607a73c00fd1958e0ce2e2c15
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting an intent to redirect users to phishing sites or further malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb8f6be78---27093372630.pdf In PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/95065918602.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/59224afde1e1b580435f541da852b4ab/vamujufaribilejunim.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/94587060600.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/25886521200.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/95217972685.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a043c787302---pidanizakumiwap.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6d6028ce9b7c22779994247b8ea9f50c/tonolefizamufikim.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaa019136---pisixamedus.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160de1823bbf27---jadaxemirelapaf.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210714030031.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/refuwere.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/96533576514.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/reladebase.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/54400730861.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160797ddbd3eb4---roresesemeleme.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/93352348486.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vuc6oi0vk4jsovcijoph3ogmvi/setogi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534f98bf33---dopulodopibibigezavul.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/4197782308.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/fibasalagovi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/plq9618j4ll1mm5hap27lqtbd4/28547377381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pastillas+geslutin+200+mg+para+que+sirvePDF 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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11028 bytes
SHA-256: d291bf5e36bc1602458f000ac5a36ab867bd81d9a313070d4c651414d5d8ee38
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 18232 bytes
SHA-256: 463b9e15819079704390f42c8bf50b4dca7cb97865b6bbeee237e7ea73a5a11e

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