Malicious PDF — malware analysis report

Static analysis result for SHA-256 b734d0b16dc6391f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-29 19:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bcb88e828eae927b3af93a1f2c4a6cb SHA-1: 58faf279c194ce35e95c63a5f31ae8d68d6ce0f7 SHA-256: b734d0b16dc6391f61d3409e5df28a566f02a116acff194c7288219aaf0db033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nandeestationery.com/userfiles/files/72370243125.pdf In PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/99452680058.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/76317054763.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/sejuditojajikapikotid.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6681376934d675b3391911f39ef2cd8/67684231022.pdfIn PDF document text
    • http://simonide.org/userfiles/file/27011653729.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/kadeguguzolepujoxoxuj.pdfIn PDF document text
    • http://master-vin.ru/files/file/97398588131.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dejitumudiruvusanos.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/is47osqmau9i7gh62d4pb6ncv7/sigakezesezuxajutaro.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jejiwitijaj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609080d01ff06---75964733219.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/kobipijefigev.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/64523536168.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dd76cbc8---wuvaxegikunod.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mesenufupilelepiranokem.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p8qmi7tq8qe5uda3lku1r0tr21/kekebivufoxaga.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/69503223173.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dezovugiwuziterutax.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/68915734013.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/4305206058.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f95f812b0---17565645008.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff98cb50a---23750425486.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add5abce74c---zurulapukiru.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/bijatenamuviwoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=self+weight+of+steelPDF 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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10288 bytes
SHA-256: d427d47ffd1cfaeba80573682f0149f400a2be503d6e38cb6eba3bb710557d1c
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 19032 bytes
SHA-256: 934838923a92955558f33899f01e86ce4845909a64d55f7718662fcf779ff304

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