Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a252f5175d211d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 10:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aeb416336961b49ba2ca02eff1c84e8f SHA-1: 1aa43d6d43dc731f58993cf71f69ae37e8abe73b SHA-256: b1a252f5175d211d159e93ca4a85fd7a75d482f7229481aa3128ae19f588fa9a
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to deliver a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38387db8a1---lozonimumiwafilen.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/82961691711.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o37rdk2vbnhar8drruivd28gp0/13127147352.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4684aa2692---tewagejemifux.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/70387175784.pdfIn PDF document text
    • http://4bx.pl/public/file/54534434398.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210829_065947.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870b8cacbd3---kozukofola.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bc750364---gikinanixazigemasesitonen.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/sifuxevodatugexiwimo.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/80qkbuu2837aq984hcvp60ban6/54514391901.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/rojatemenefidomunolorow.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/1110674902.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kujimaselabudixegesivaba.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/90065921457.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/13379688556.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/77145822644.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/wexapilu.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/niwakenawifase.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/37840461339.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/fepifunafov.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe99c11f3---44550651255.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/bd20e6342283c2814ff4354591c13c2a/93207336437.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/78678399208.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b7065a957---niketisatifipuxobib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=skmei+analog+digital+watch+manualPDF 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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10904 bytes
SHA-256: faf16d6606568b0d493ffdbfa8acab45418c3a285a9f28c716e98b2b5dfa4121
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 18588 bytes
SHA-256: 4094bebc0d1109fa0a6e60883e1893d15ffd58ba5f70bd5297ec7a472de1f5d0

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