Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7033e9a5bef3d2c…

MALICIOUS

PDF

99.5 KB Created: 2021-07-16 17:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec587d8f4164dd6f24823a4d211a69d0 SHA-1: 4b183407f20e3db5139b8174b345d1b7f2d2508d SHA-256: d7033e9a5bef3d2c2728208fbf714033f8097b74fb090cc57b2125c3f0bc2789
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs and the overall structure suggest a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cualuoihoanmy.com/uploads/userfiles/file/42802132554.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19feb3b8be---39108771275.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/33050210223.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55849804149.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89d159cdc---85287094399.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/69465332703.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/20c95b89665aea13923826ad8d9d4b3f/nujotazigojagoto.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c3c2d05f4---2216872682.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n6914ar02df8n8h204a5d3sje6/wobegalatulamijugunopevev.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8ijal9aenceu6l9v02n48tt108/dijakorufogori.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bf7c29b28b6aaaaa257050191e9abdf5/17401513771.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/bexed.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64531965088.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/90635558729.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f560b293e00af87263995a610942acf6/67270498591.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17t4tp88vofk7pailmggq1h71i/643501324.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5rl8mcldlofclcckohtmulsfh7/52394735431.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/80664660795.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c41621ce490---66919820797.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6chk1f0s1jq311a8h24j2frdjt/nekefabemewafavorapupetaw.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160782bae2306e---kidapunekav.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7790d0506---kiwafinedenufedej.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/25a0980290d17227a37be2044a0c15a2/33269149611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=annabelle+2+full+movie+in+tamilPDF 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_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 18496 bytes
SHA-256: 6da7d4b8e22138608630d4f0c47aa1db20e33dbfe3d603ea1326356ce4aa7866
font_01_sfnt_off000150bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D3 10516 bytes
SHA-256: 479c250f7be5567867b53f61fb06612adf96a23f3a3b9e908bd31b8d20cf00a2

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