Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c1b4f4a1d10e5c…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 08:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 959239d7f3866ea649519c5352f1a312 SHA-1: 254e32b08acac90aaad4d466be6401abcb6269cf SHA-256: 36c1b4f4a1d10e5c9c68a316df6c5f7292976fa7f508a273ffad7ba84e16fdae
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 compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hirurgija.me//files/vobabasuseniduxaxob.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16073d88e3fa88---87160115553.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43373d1c9f---ronereritulirorese.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/lebowuvoxoxogunidosule.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/46511639142.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vujibasuvikapova.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace28ba865a---80926370586.pdfIn PDF document text
    • http://k1a.ru/images/files/file/61291120578.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/44100568347.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/kunivawesuj.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210602221127.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/75884534526.pdfIn PDF document text
    • https://ivanamihic.com//files/72882905615.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ba9eca1ed00f8c33a6273b00e4f7c6bb/84722088071.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vsea72damd2t5r3sp8qrj0sgj2/raruso.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/rixudunix.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/89897466419.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caebc1706af---5526619442.pdfIn PDF document text
    • http://mid-europe-ex.com/judolomodetoguxew.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210621085129028.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0ceb18eb---niludidifimumet.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lp0gjgsjpsdtr2b68hm66ocptk/72023778553.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/27027653695.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3coe90po5egfstl7itjecth182/fusepumosadixag.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e114a68c---702953398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sample+response+paper+examplePDF 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_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16896 bytes
SHA-256: a4800a274eca657bf5e20d0c347607afffadaad977954a017706e6cd7db0821e
font_02_sfnt_off0001461d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461D 10400 bytes
SHA-256: fc81410e95538e0ccfcfa74ec173b1502ed0643e675f602aaecf53f286d0eae0

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