Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a71fd335ed7053c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 01:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d05bb18d0f446a1ea56b45ed78c4157 SHA-1: 97c50ea45e75bb8c7fdca2b327f3b27bc36ab38b SHA-256: 2a71fd335ed7053cb193bc3a823621e1972cc0f81d23e17ee7715959b559fbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The document functions as a link farm, directing users to multiple compromised or unknown websites, likely for phishing or malware distribution. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://stphilomenaonline.org/userfiles/file/lukuxafavomawe.pdf In PDF document text
    • https://mumegram.com/userfiles/file/23970121809.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9213d193ce---wojigazeloporabi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f2c4be65d9e1948aba18c8ba8173342c/fedadovisisijekivigiguzef.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/ruduniwupofodiramefum.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53751675223.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/moregolavojojokigod.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kepinorukakopupuj.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/48056458033.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/xenikuki.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/direzajixobe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8caf5a190a---27038691044.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/55005479775.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/kikixututowasexukujejup.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/56bd5f9d487a63c2daf95124e6bbd96a/97487806362.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/61066297021.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jtv3o12gde290i0fqf800c38v3/davazazedevuwunaropaloxa.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/kipurekidoxoxivasazajaw.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad2d6276a---20446954833.pdfIn PDF document text
    • https://phukienbep.net/media/files/lejugeti.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/066304ca5dadae3b7acb18ed2fb2c2eb/sujojosuruluzenozalomiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=qa+manual+testing+syllabusPDF 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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 10644 bytes
SHA-256: c0f7aaf15ccb64d831a8b287f23f188cc497794f7f17537d0ca05f9106e21daa
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 17360 bytes
SHA-256: c4b41aa950e1c806658b9f4a7259cfb30b384d8fa4b8b0c12a06f6b1280173ba
font_02_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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