Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b3eab7b61c20da…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 09:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cb5362e4584834c148b4fc6110b3da7 SHA-1: 13598ee1fcb9fc4f1f319de168598ee85ff9d283 SHA-256: a3b3eab7b61c20da2596bb48324b9f8de982337711eff9e581201d08b3511cb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wamaeassociates.com/images/uploads/originals/file/20306072589.pdf In PDF document text
    • http://ttc-investco.com/img/files/vijobam.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kopatanerekeritinizimabi.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/luvafebukev.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/18800382835.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10744327511.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sidutepudomanajamakofi.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f03fa338d4d2e0abe857995e07109e3f/kexuwubuxazeragenele.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9ecdb38a64d728335ab30ce44747bd56/24449225731.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jutasekovowavu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b686b8bc---jikuwoselemedekorod.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/panaw.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/72598842846.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_03CE0CA22E574152.pdfIn PDF document text
    • http://hadt.vn/upload/files/sezewafivi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff505e36a2---lotusadokemomasawe.pdfIn PDF document text
    • https://linardi.ru/files/file/97026657980.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424e7620624---10134251486.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/sulebuxuvot.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/bulukubesuxowululop.pdfIn PDF document text
    • http://peoplefoster.com/pliki/solitad.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xakov.pdfIn PDF document text
    • http://umhouses.com/uploads/files/rupawexuvesoropomexiju.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/lunulira.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/37895167482.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/segodewasuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=iso+osi+model+is+used+in+which+of+the+followingPDF 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_off0000c333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10800 bytes
SHA-256: 34aae2f33af56632a3fc1b2c3ab34add2c30b6ec68481189b94018b1f0bd7502
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16620 bytes
SHA-256: deda58f984961453666c0df811354fbd6c15f527086e9b8aeecf295b3bf91950

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