Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e2f24d4606407a…

MALICIOUS

PDF

83.4 KB Created: 2021-06-06 06:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dff3394c3fa2ae767be6e6d805cd9f6a SHA-1: 8ac37d05fcafc49dd957f54a0a9afb9b91137c1a SHA-256: 27e2f24d4606407a47d87a067ff75e4c44878edb6f50101d078a08791d6950cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, and a heuristic firing for a visual download button. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=s.d.a+hymnal+book+pdf+download PDF link annotation
    • https://topclassgreenery.nl/images/file/48775305339.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53302b8e5---sabururem.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d424e30cbd2d56e2ba7d83e10781de12/11626147716.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/75852055623.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160948aaf0ec9f---20047338247.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/72348805255.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3242029288add46812079ffbc6781e2d/xogopuzomozuji.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8243fb3426152e3eaa3c33eadbf89f99/96267974037.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/360fc0f0cba1dc249c95c425fe5d3f56/tazosesujedalotakejesofev.pdfIn PDF document text
    • https://makenie.com/upload/files/18218743420.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/40311115790.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/l2cbumokni40j19qujaqnsk216/bapesotudibena.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fvglbaftrsa5o58v0qquj577nn/jifubimodegozitogaduf.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/km31o3cluasqmqicct60obbvp8/56303579184.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/24989191641.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6e954f4---vavozinotoditifili.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fdd23fd9---rufupabapavixetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5080 bytes
SHA-256: 7c3445a67ff40f3e664bab8956045c21efc79c3d2d719446b61bfbb4b70a1744
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10824 bytes
SHA-256: 9fa4cfaf9a9ed5a41d81fb040ffc064ad6864b013c300fb09df2b8800ace46e1
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16504 bytes
SHA-256: e64a02b7c68a251ed2758d8f13eb64394c686feb0f6cabdb371362ca75a0cb24
font_03_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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