Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c7a266cda7b5b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 19:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d923d054c56a831a24429de6fdbd1a0 SHA-1: 4a30059f75d678660e980a009deede5eac090e03 SHA-256: c15c7a266cda7b5bf5aa187641e46f2ca0c610e42674d4237a5b32ea2825b3ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=jetpack+navigation+animation PDF link annotation
    • https://kudamatsu.org/userfiles/file/madaganeroxikupudon.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161382a6d8af48---71816021716.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/80921015742.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/degowegomowato.pdfIn PDF document text
    • http://aminotp.com/upload/files/tanip.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/zutepa.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/nogitekazimonorup.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/wetegutezo.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/jobufuluja.pdfIn PDF document text
    • http://cartopack.be/Images/file/10432531591.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fulakusurom.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/bavipulamejakef.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pobebev.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/tadubojedomovu.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/75428797592.pdfIn PDF document text
    • http://epicridesnepal.com/files/gekopakitifosirumete.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/67155924190.pdfIn PDF document text
    • http://crm333.com/documentos/file/90153366487.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/31068428717.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fe1a9ff6---73852045738.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/83481982804.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/89834979381.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fapapenorufizosadamelu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/13894266350.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d18fa03---wozomilifepuvamobelenifug.pdfIn PDF document text
    • 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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 10552 bytes
SHA-256: c576e785af991e51f9a9d53aa6a9e83da8a6bfd98f68fb43e2517019dd302cd5
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 17980 bytes
SHA-256: 0fc94abd2ca38af29d2f3749cd2c1ae81679f33e0628ddb7db038436e17a910b

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