Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a868e8378077ff…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 19:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f968e31ae8a778c99345f8f3680f3a50 SHA-1: 1b4bf6ba8386c01271e94cac79b38818e25b5424 SHA-256: c6a868e8378077ff79d0595b09e65522ca8b563d432690b42a463c23303914df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, and the structure aligns with a spearphishing attachment used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://okwmd.com/upload/fckeditor/file/tazitabumapilowuwokasepa.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db99becd78---ruxudazuvoju.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/33709536326.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e108d4e0d---2423449950.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8da534efe2024aa4269b7d1d56da918a/1763611419.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707f4db5e83---dutezizaxejalokanefosi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf8143de2f681c18a17ceb779c53e3a8/17943230953.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/59622562285.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47fd87b102a44ab4f824d1ee877ff9b3/76738469388.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/5455556970.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d40889c2b210f2beb6ea4d9bea09687d/fokagebamigiri.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/11078017234.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/migiselomazedonolap.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tewegizeb.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210706_161753.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1tgujfsr6c35grmvdvb2h24h72/wezolalepabagajafip.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/bibaganoresabuvis.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2336bd883---xepidi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/rarifepotaxas.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/34641656080.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15190995812.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbe379fca---1413240252.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/7189859598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+edit+pdf+files+using+adobe+acrobat+9+standardPDF 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_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 16736 bytes
SHA-256: fb674645397dc03eeec62703dd23b4d33166598ae18e088688a68a3edfb786b7
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 11280 bytes
SHA-256: e8eca37c68741b1248e13c461a9310afcc25ff9abdf85cb05d839ee75a29c3d2