Malicious PDF — malware analysis report

Static analysis result for SHA-256 20026fcf1c28de38…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 05:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 876d5c34773d475ebbdb5f18deadf194 SHA-1: 26fada1cd62da47c44e474e9ffbbc6d5310a2c7b SHA-256: 20026fcf1c28de384ab11a9db941144b1a578fa8572cdd1e5abfd8e3a0d16337
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, many with suspicious naming conventions and UTM parameters, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://archism.ru/uplcv?utm_term=paid+icon+pack+apk+free+download PDF link annotation
    • https://kimansion.com/uploads/file/kunomojuvaxodoxafeneji.pdfIn PDF document text
    • http://reichspfarrer.sk/file/pumogugetivuj.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7d88ed447794f8db94cf7dc0129acebc/fibevabomasibun.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/12220792853.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a8337373---vitokexalujiberamazajux.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/wisoxabavu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/resivuworigadu.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/getixegufufujebe.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/rimolen.pdfIn PDF document text
    • http://domosplast.hu/files/file/xubewasajasezononus.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jevakofav.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/zepomusop.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/pitubodukazoxuwobapibuz.pdfIn PDF document text
    • http://epicridesnepal.com/files/dojozikanuvugog.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/kovoxigogom.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fbc33c2e---jopebufagom.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/56031758602.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/muraguvefafepokip.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/novotepok.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/geroximupefi.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/velawuvoximivugowivan.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/59883701742.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/nuzug.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/ginuda.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/8968009030.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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10528 bytes
SHA-256: 0e6b17423ff00379b0b1576cd205e20508138ddcedfdf97157b17caae340a96f
font_02_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 19856 bytes
SHA-256: ce9e5f57c540e43b652f953880f8c174ba99cf3d1988f290e9ca084c279a94ce

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