Malicious PDF — malware analysis report

Static analysis result for SHA-256 57806a6241cc54fd…

MALICIOUS

PDF

102.3 KB Created: 2021-08-15 17:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b333ff2903b507c0adf64164b2e6df96 SHA-1: 6c9914bdb4d0e29fc458f57491110f4b1f23edf5 SHA-256: 57806a6241cc54fd69af0fca7b3a9493be63638f35ecff733285a7a20d566893
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb5214c02---paxemolexidutifiw.pdf In PDF document text
    • http://learningkey.org/userfiles/zujapenovigisixus.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4d916f8e44641814732c1e1652ea63a8/33995236536.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/fizomuzibevivipepibus.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/livemukukobopunuwipake.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hdejrd7kh3gl4jhnp8srilu9oi/46083248585.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202173114850.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/menuv.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/894b4a4b04182b2e673f15f3436830e0/59337623914.pdfIn PDF document text
    • http://lj-group.cn/upload/files/65235343162.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/lezozajeliborunok.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/petorene.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8e7c53afd---mosomitusiradokusumino.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092c83515851---lezexu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948a1bb6898---sonitefuji.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd8c7fd9a---kivabupenadoxu.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/69525092071.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/79751667263.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61743334846.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/48c9cb4a7c51607d0f644c2adf97f1d1/29113714093.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/pojimagukomomonofumo.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/favolejulafolikaxonuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+movies+are+being+released+in+2020PDF 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_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 17176 bytes
SHA-256: 4cd9521c79786c0eaa8b09830a2e41bdfad08a9a0adcff094d0367e38e0fdabd
font_01_sfnt_off000158a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A8 11136 bytes
SHA-256: be77867c3850c87fe0bb363ec3f1d89c1609f95976b098139d69995064fa5f75
font_02_sfnt_off0001724f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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