Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c7b66bd7b2e8f6…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 06:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e628f81ee8ec5941b73fa5547c3bfb61 SHA-1: 40ac6721fc861bfee37913e132fe15a7e528e23e SHA-256: 29c7b66bd7b2e8f6698055125cf4b58b7fb6f521c5677e9f290e8f98a9b1ea44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on a variety of domains, many of which are flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to distribute further malware. No scripts were extracted, but the structure suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://canxetaianhduc.com/images/file/vefifedezin.pdf In PDF document text
    • http://gr-chem.com/upload/files/23826948115.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/nufaxufabuxusoxuxak.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/92157092689.pdfIn PDF document text
    • http://meta-min.com/files/4405794158.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/90990976420.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/suxuzusemolanidewirimis.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/sixuvojazirituwas.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/27627836934.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210903122240170749m5e0xx6j38ho.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/larexobozabizejezefa.pdfIn PDF document text
    • https://gilbertems.com/videos/file/jufotino.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/fenavofajokitejiba.pdfIn PDF document text
    • http://indel.sk/userfiles/file/sovonixawevozanofu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b049bcf7fd---63736238056.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614650a07993f---49500533846.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409827a7d0b---teguzibipevuzunazof.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42650007632.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/86918428337.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/tolutofinuxubuzasu.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/69878135986.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d266d6e9---pumuv.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/98087489982.pdfIn PDF document text
    • https://svltv.in/userfiles/files/fewulode.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/nerexageduropeji.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/bowojisesoveborataledar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+emotion+code+free+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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 16144 bytes
SHA-256: 7514b0b5176deb7cf106f9df991f9402c53623f2167f421d69eeb712659d3ab9
font_01_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10472 bytes
SHA-256: 5aa398ee79b27b2476d07a1b44ff820ac8308b581d159f4d6c1cf7983cc67908

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