Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b3ce8fe622d3d7…

MALICIOUS

PDF

94.8 KB Created: 2021-07-25 07:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96cb9512194649beb5a02803fb0c5501 SHA-1: 44e1cc79bc6b0e546a46103af15dcb6b274eef54 SHA-256: 54b3ce8fe622d3d749762f539706f7afd9e84ddbb74404f3ed89e43811bec5a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://red-adlay.com/upload/files/92628229750.pdf In PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/pinid.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c772d5744df---basubesosomomezamiz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e34e7aa60f4648358a3fa7e37eae6762/56624297001.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc812474b87---50950687149.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/803a9ca082f387ed645f1349076582bd/28775988047.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f41ae180906---96309885135.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/21813tcpmj8qmu7na9k541tdk2/lodebidej.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/44512043901.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kekeju.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/38d2dc03cde566343de71caedcd5806c/majene.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/60417076059f19df8a7d74cbdf47f939/46931681743.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/povogoxek.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/bifula.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/hqnma4garns5sl72jvrfu9vs9b/wanibijunenatig.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/efb6ec5e491096eb66e4445841935eb4/zefinajuma.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74dd44de4---ronelisalogexi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/84536519497.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/uusojns54145gavgnu5tfl514p/loxesob.pdfIn PDF document text
    • http://limoride.net/gallery/file/liwarijetatax.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/45ec2a458a560970f113161cd1590359/nokedoxezav.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2918bfd3d7b904facddb192c50bfa3b4/35565107374.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0762920d7---fepudani.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kogetezam.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fopazirivoxokak.pdfIn PDF document text
    • https://mfdesign.hu/files/file/41669703624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+quimica+raymond+chang+10+edicion+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 11652 bytes
SHA-256: 67715897e70df3582252fe9fa241823a34190476c259cb95c1453b165e1a14bc
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 18704 bytes
SHA-256: 7401216cc4a83fcffcc51d290ee6a80a67ef2e1a9dd2eff249500c484eb1d8ba
font_03_sfnt_off00015208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1