Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb4a994af7fc51c…

MALICIOUS

PDF

76.4 KB Created: 2021-07-03 09:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48819112ce3227a77fb2038c8a16039d SHA-1: e7121d5f27453176bf8bf09d5ec48674ff7eed76 SHA-256: ddb4a994af7fc51c016b5aaacc9e7f5de65baa3509dc7f585b4176812c6b47ee
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to download further malware via compromised CMS uploads and disposable hosting. The presence of a 'download button' lure and a callback phishing pretext reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/11c634719d66f028ec217a7761e24507/ritexafowavu.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/58e627555e4530cd3cc15ad4c7ef52b9/66989648408.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/zopakokefatamoladugapok.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/jazuxerijufudimosuvugoze.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13e2780be---63955480716.pdfIn PDF document text
    • http://honda-vo.com/upload/file/jabipufekofanixolum.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baeb9864ac---limorunaretud.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/73296097584.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23353199647.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ab8367ce---48277808520.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7bce3f9a---zuduwapijasoposejibeb.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/gigin.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f37c2605---57255305098.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e653bb7e---gunananizatajowa.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac902711d63---27024401804.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/dowaseloxupanevide.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f9d6aba14---54917572621.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4ri02b7i04059slodaee118l22/pewel.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/liropigeboresuwobinumu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf201998d6---12866080017.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xufanibi.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/20451581623.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/93094605325.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c362a26c---kofeguveder.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/80056534485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=find+address+from+postcodePDF 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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 16588 bytes
SHA-256: 721a20e8b44f5968617e331f2c4e576a9fe488917bb8620536c228f7a0e4210a
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 10712 bytes
SHA-256: de8d1ed7ecb7af988ff9df845b42f9fb0cf340f24aa590de6eaff01ed1432e7f