Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436acc4edab340c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 14:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 138a06b0fb9621c89ef23794903dce46 SHA-1: f0af71edf01f21b903db82fbb66f95776ed0fb46 SHA-256: f436acc4edab340cdd8543a8dd842793533c2e0bd2f6c80cba3b12d6831c3533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

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 https://people11people.gr/uploads/File/41452129894.pdf In PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///dubefubuxigoxuzab.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3882081126.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/69638015206.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fizokabujowetixokuxuji.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/50246539455.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4ebf453f2d1000647ef46d9757c033de/67799830495.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gojemev.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/mebako.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/87611432339.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/577aedd288002adae29c271cbf1f5c1b/96836938973.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910181111498331.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/fekirutajaninepopolanaka.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/xugavuvu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/larupurodidamunilupezesir.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/fofofumanu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/moliradusaragakivodunusik.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/72036189387.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20303db8537f87d2f061cd3c856475de/positigek.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/61737642930.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/fowipufodunenumumow.pdfIn PDF document text
    • http://aquatherm-graz.at/files/kuvigebelite.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/49320066698.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/sosaw.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/vadosujewasu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ee14d02f2bfd0af62ef4c887db006b41/85389441843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=robbery+bob+3+apk+downloadPDF 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_off0000b532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB532 10676 bytes
SHA-256: b8cf959c215f13c6cc2d9faceb035e635bebcb0f73aac7eb8c30a30f27aa6cdb
font_01_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 14504 bytes
SHA-256: a3f3a2f49480ca9a66111c8c18524198545d247ee593826574f875687f52961f

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