Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde19906a63c5bb4…

MALICIOUS

PDF

89.7 KB Created: 2021-08-19 15:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 527308465b0c133e6a5cc7f7a8faad96 SHA-1: 5ffcabb2fb139d9cbfdcd436472332d08072c772 SHA-256: dde19906a63c5bb499ce72220339a8dcff0c3aa44c219e1f156a60f8ac898bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this, likely serving as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607de02d5ac1c---dutewopexedenemuxadojaso.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf982366dee---63606469880.pdfIn PDF document text
    • https://noddy.nu/images/file/fifuseru.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e8c7a01ef956d3919f85543d6be0ea93/85029709875.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/3562969085.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb746773d1---zexit.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/74544371375.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce12394fa---goxuvoxasinoxoforus.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/metelufales.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/40105465979.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kilulekedugijitub.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b8fa4249---rulirupo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/34577197196.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/10928453778.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/84329680750.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35128fff3---11991198673.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/beebdccbd6818005ae132cd66626a77a/fezowigevadumawusavonun.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd5a45f8fb---43496841333.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_C122A2139BECC5D7.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/zovefirewafarexubupu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f003965112---guluwatodolulupedogobopu.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/sevodudunufawamizomi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/15280058193.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3911d2d0a6a4ca07dfcfc895af174c6d/xoxajupuganupab.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/88588304733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+picture+settings+for+samsung+tv+gamingPDF 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_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16960 bytes
SHA-256: 86013ecdd5a53246071d4e01469da015c3b0ad7a672b2763be443a102ce0d503
font_01_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 10996 bytes
SHA-256: 566fd6eaa57f301796b9cf51a4939002c70001fd9d85efb200d7e53a47ca5cf8
font_02_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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