Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a00dac64aaa43c2…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 542c77bde8a45faaa8f4df88316bb43e SHA-1: b2c8449e9295db6db6f93b39dab84a86326af67c SHA-256: 7a00dac64aaa43c23c2eb7cccc6b26a10c2309fdbfd2c533dbb050fee0d41c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=exponential+modeling+with+percent+growth+and+decay+answer+key PDF link annotation
    • http://www.cerel.eu/images/wyswig_images/file/27808565729.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/mejewedotuvi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///53350777204.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7453ae8b1---44482524379.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/14656383240.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7eb8a6cb5---korixenuzigamipepo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/bf9o6ddvln0hsvit0j2vmpoqj5/vituw.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/dudanojunilenewif.pdfIn PDF document text
    • http://thaide.org/userfiles/file/45443896293.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd27a871f8---45252079296.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wusupupijomebepan.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210525045252.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/7991617796.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b66477e50e6cc88aace2dfed2f702ea4/39589104076.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/20204139111.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/76042827709.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fo2rbrj8i3hblhhefnn4jr6au1/nunovorenalokojolato.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/63533728812.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a338d3f6ee---57335609532.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea2155b56---zebovewekezo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96140022862.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/34953585917.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/tesozemiwugufiw.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/pevukebumovileloden.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vimoriso.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/cedb9496336e857caecd63fe430c811f/liwexivimodoporotol.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/biverefefara.pdfIn 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://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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 18104 bytes
SHA-256: 6d7a64aec5f7cd74a6ca51d2b0686980907298464d7511b19ff7a94acb92bc61
font_02_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 11340 bytes
SHA-256: 622943af35c725e13944768031af3da0d09bf02d49b6af2630e6b63cdc712ed6