Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e994f1188ef7b3b…

MALICIOUS

PDF

106.2 KB Created: 2021-06-27 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca3e3f96e7a403f57e958244bc27e7e SHA-1: aa9f0bd68d26fcc33244c74e0ffd1c89093cc66f SHA-256: 9e994f1188ef7b3bb0c36e09cd3f476e0890986d0eae0c17dd4843eeb95e7327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://oniceh.ru/uplcv?utm_term=metlaw+legal+plan+contact+number
    • http://elisa5888.com/shopadmin/upload/files/vujoj.pdf
    • http://massimoandyuethui.com/clients/69227/File/bupuvazijawaxikobawupoza.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d5219d296e8caa2ba4f782b57b01f81/dukazoremanejeduxu.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e58ad4f9875db512547f67b51e30d5ee/dutokanamuzomimoxifa.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42176ea70f---11826899060.pdf
    • http://blackhorsesc.pl/userfiles/file/tojasotogu.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693c3f13bc---jadebinamotilegejobad.pdf
    • http://bearings-home.com/userfiles/file/55053230689.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nn8j4uf0epa8pdci1v64bn8s3g/jafogujuposexazotir.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2882684c3---39663319288.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1chg35cdmmkp15tg2joal4r839/xatubifonasofuzibatolufot.pdf
    • http://huiking.cn/uploads/file/071056302010.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bq46ppe703o1gj8fdg14e76g71/7978973451.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrpeidtvuil0t4h60dhl9ktsp2/51403190877.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd701b1a43---55781836533.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jdcgemf3lcst9snotl12894i13/befegaxepiwejowurila.pdf
    • http://wooshin.kr/uploaded/file/54266181560cd51966257e.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd10301a62---jixupugemi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072666a43220---gusiwedojojutefumimol.pdf
    • http://mamtomchabahai.com/uploads/files/files/12486312853.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c41eea3b---6845175216.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/xilagomiju.pdf
    • https://batikatravels.com/userfiles/file/jujutetit.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b61.bin
ae959e06c5e628ed95092c0f1aea8ce215e27887f87c7c157e9f3dc76d197ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 10776 bytes
font_01_sfnt_off00015403.bin
08d98b1164c4cbf94f3eb11c430acacd6fbbd491380ce6c595de329bd580c8d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15403 17520 bytes
font_02_sfnt_off00018210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18210 16792 bytes