Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98d78e7daa30661…

MALICIOUS

PDF

91.4 KB Created: 2021-08-21 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b045848e07f52a0748380b0025b9ba97 SHA-1: 53304ac56b14b063360258fabe489889d6bffbf8 SHA-256: b98d78e7daa306612ab32a5738581fb8efac7350f9e9b27ada557ae80b4ba585
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to files hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://ecolservizinettuno.com/userfiles/files/42881857137.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9f079a5d---62544881803.pdf
    • http://ahkjt.com/upfile/file/tegusozisirixigufoj.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f85ad912---meguzodufuwerapafewi.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/6e2815fb25477a16185b25df32b038ea/pifojuboxukevariko.pdf
    • http://hcvitamin.com/webroot/img/files/gizivuxogumepepejer.pdf
    • http://micronforgacsolo.hu/UserFiles/file/vunib.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pudotomalubakigirekage.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f376204291057191e6945c6571e48f4/81850770847.pdf
    • http://teplospectr.ru/images/files/55283152047.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096613251612---tamuniwudovuvunefumapuwox.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/xizunuridisozozuzafovo.pdf
    • http://drprdesaihospital.com/uploads/6167939013.pdf
    • http://innova-perila.ru/upload/files/58297557368.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078976e57896---46504725206.pdf
    • http://firanywiktoria.pl/uploads/editor/file/19718642516.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/a0cstcv4111ltjuvvn6ali4qvk/wararojagegoxarezometu.pdf
    • http://mcap.cz/images/uploadedimages/file/9416917435.pdf
    • https://marosme.ro/hirek/file/69940782258.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcccee2c495---rulepi.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e563bfdeb3f---87956945638.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/266oq1hgohicngnqfdrcjbim38/91845362611.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73641af3fa---losojowasibabomutuwebu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=test+dpc+4.0+6+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f5.bin
714e7824dd6014fd15415fcdf80451fdb80ed9325d0d17d8171c1b9ee333e3b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10888 bytes
font_01_sfnt_off0000ff6c.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 16140 bytes
font_02_sfnt_off000114e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
font_03_sfnt_off00012cfa.bin
b1c1051ed7e928342ec77f0e4bf0488a891cf474d13a1d082dad5503bdf04f4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 19300 bytes