Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe03ba6a70a600f4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 15:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 2cd29f8ebf4d92c87d2f01d8a35aecb9 SHA-1: af5f52166cc431cf5f0845fe1356809d15ea64ee SHA-256: fe03ba6a70a600f4e00cc33b839eab8f6944ed5c52d46c07d50473a5c8baacd3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the link farm structure is evident.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1998376ba---45561805265.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a750e28de09---34219250556.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610320f9be57c---nidatakuxarefemike.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9bd2d591d---5877865937.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/55097269993.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r14i6r63ht6b3ki1841scla44u/pukobapibasirof.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/sivokazupixuli.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/wezulogaloselokikapud.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affd800b0c0---dokegejuxidetiwababavem.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a269911e1b048204c64b849bdb956be8/1644048966.pdfIn PDF document text
    • http://topas.lt/userfiles/file/43638331071.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/tumivimiwifoxog.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0565276928---sorusodezojis.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/96296428714.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/8072480172.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/fusenodifen.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/68225601584.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/zemiximelosa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a46301269---3138239264.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/99390549051.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/54316628786.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb4242a42---22268435576.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccffb4aef23---71479715570.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wasowozema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maureen+lee+books+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_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 17316 bytes
SHA-256: a6d0af2bb3655a39a9eece0fc770402bfdca918fb8ba84796a39e3cad8407bfe
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10628 bytes
SHA-256: e8c428ad6ebe445bfd824d8652b4387431db13a974b67bbd853c51800cbf4942
font_02_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1