Malicious PDF — malware analysis report

Static analysis result for SHA-256 f565f8d95a1ff383…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 05:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4bf4237474fbcd1903d93660e664941 SHA-1: 61f403935326840003011b4ffaa4abeb074b8b4f SHA-256: f565f8d95a1ff3836151405528e3400b15c183d3c80c32ae0011840894e75959
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gwardiajuvenia.pl/zdjecia/fck/file/59329292040.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/8982689321.pdfIn PDF document text
    • http://hidropro.hu/upload/rejibujomotep.pdfIn PDF document text
    • https://highrise.pl/file/75322511897.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6bc3f2c92507db32d78f330e700e00d8/fobobikarusapiwulotoro.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/34888863397.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///53047696057.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/dinizejejikojaguwuwinajo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/labupinotabirekaterodo.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/gazesowuponulokulukatasi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75993468489.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/43515889931.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630922790.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1bf03a116---razasebefaselolu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/26358751863.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/16883455946.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fff78d1767ab3d95ea79ae28bbe77b03/xifibororafor.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/mupevemiranoz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7bbdb300a43c83afbdfafc15946c98c3/77411136206.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/73407323540.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/19328994045.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9d0702b6---91065839929.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/10720410387.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3cef847f7---tenabigajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+dear+hamilton+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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 16084 bytes
SHA-256: abc339d671c45d4921943cd5d6c4fb68f1fce5b6567224257b9c99d2f6752a39
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10700 bytes
SHA-256: 40a23f9c1580fbd37a6304c7b6f0cb655a61237383e8eb80dc8c79a91eed92f5
font_02_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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