Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad03ec85d476ead…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 09:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa0af7b08921eab18b162de7cec079cc SHA-1: 544af96ae10e8f19b5c329e6a86b9d2a3de16ef6 SHA-256: dad03ec85d476ead2da731a7bae489951f3088746f47eb166e36d81632392e98
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and links pointing to compromised WordPress sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ballmillfactory.com/d/files/jetuze.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e792d9452---lonugawat.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/mizagosawexegapipefiruxaw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k3leia5tii93e4ke4mpc4463h0/vegarivubenireror.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001f1ade383---66485089455.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe6e7515---28263076919.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowomet.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec36c2ec5---tedawevorukinogifu.pdfIn PDF document text
    • http://techbis.pl/files/file/83931314908.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f478e28e28a---7565312614.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/76883442332.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d4c4488045d7818ed7e505aae446c463/senezutorotononofuweke.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/ropep.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/31703569695.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7b9d478cf4351c218ec130f14f75c67f/19882902119.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/16221287815.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/vofumamaxakajolevogeviwo.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/bugimizopibinufofikedom.pdfIn PDF document text
    • https://mfdesign.hu/files/file/laduvirololobefodaxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ccc56b67d9dc5c4168356060428f3e06/sojarebimubulokojuvib.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jabijopifatigufabo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e120a50e9d667ffd3dadb4cf2a2dfaa5/fexijedufu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-4/20210604214903969686.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/zakugupebevojakomazivas.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f72796bf033---xikenusoleliwofidafexa.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/78900687322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=building+applications+with+python+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_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 17576 bytes
SHA-256: 4bb67fbe72fd97b49d2cda75d58956d248d659dee55fb637c7f3e95803df36c5
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11020 bytes
SHA-256: 939104480a70ea9770effd72de6581acaaa9434d0b0396e476819933ecd577bb
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1