Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1da5e7add3563…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 16:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6351c74bc2e205f410c4a5c9cc46b2cd SHA-1: c820fa9897d0f59c7e1473be650d6ca4563db306 SHA-256: d8c1da5e7add35633749e0e4bc8a037e1525f4e589b5061be79af1a200466187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://livres-arts.com/ckfinder/userfiles/files/57279763795.pdf In PDF document text
    • http://headlinesdinerla.com/uploads/files/kibasa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tptcmed4i0hipgtja0e2argci4/64233155667.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/puxazaz.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/92721878955.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/norivojufetefesiro.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/19247914813.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jazewidowonawepabuv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/notabeniduga.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79228584164.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/4252283584.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/vomorivitupowoguv.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eaa1b36af7803230a98971f5cc91910a/pinijijokuzod.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/vosudupuwexixawanobu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3aa24ff5cfebe81b7d3c481f409cddac/guperexamebenawonaras.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/81851714324.pdfIn PDF document text
    • https://adikketiga.com/contents/files/dafukisojutewasigidawe.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/filut.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/nejazazibemexiwek.pdfIn PDF document text
    • http://kgmda.com/upload/files/29172464096.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd04af969---47869139080.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/wuvewogade.pdfIn PDF document text
    • http://carbontuning.ru/file/93367336291.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/riwezezevov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=persian+fonts+for+androidPDF 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_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 17016 bytes
SHA-256: 6bc0659816fe51b04712e3a4de62405d06bbf0369ac8d48f6fc6bd546991e08a
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10300 bytes
SHA-256: d5f43f000f265c51b013c63cc2adc81da440fad11fbd72a98798263b6dcdc921
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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