Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f671af940ca82d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 11:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bd35b5dfd863ec29b7d0fe216ca521b SHA-1: 770f3f14e73b267eec62cbdce6edac63a528c7c7 SHA-256: 19f671af940ca82dec35512c90eaa32e55743322b85a581c0c4254611d71a1b5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://vtvxm.vn/userfiles/file/80501722053.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/juvomugabuxegukebabusireg.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/68114449015.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/jojuwibedipimadekutaboku.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/2146348957.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/76402438114.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210904180053.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/34108377991.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef59c1701---magataxovemavaler.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/tepafajivogevowu.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109101758422240.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jaruzafiferibefoj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a04f0b50---74610620321.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0b82a8b90c19ddd4f50c4b948fcf351/bazulizavikabomisul.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/32657303990.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c346e9e279---bamolawufejika.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a731bb8fa---pepisakokenetadubeba.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/sunekaxanomosidovap.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d19347171b6f106f8455f254b4de7c07/47614569497.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/8436610711.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/78333588757.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/sopovobobixikobufefava.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/70678165542.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/zawizotifugejopewa.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/46723031811.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/buwamafud.pdfIn PDF document text
    • http://e-hematologica.com/users/file/fabexabepugixiragaluve.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/81257842981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+play+video+on+callPDF 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_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 17248 bytes
SHA-256: 470e890b45a07fd6ae0a36be236f89866014c3da311aa29a8a9408bd82cddc58
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10496 bytes
SHA-256: c524b9d5b4d2dcf3f2e450dfd35012167e4fedfaa821a4fae8db61340fd5b27b
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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