Malicious PDF — malware analysis report

Static analysis result for SHA-256 b575b81b23f723f4…

MALICIOUS

PDF

95.9 KB Created: 2021-08-16 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2971a4e0f8089ee47b2dc4f37d99aa27 SHA-1: e382a0c7250a70677400be23c18042dee6a4f35a SHA-256: b575b81b23f723f4de3b7c8a77db358086d96f1d1422a9683152dd544179bdb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=ejercicios+de+probabilidad+resueltos+2+bachillerato+ccss PDF link annotation
    • http://dgjst.com/upfile/file/47442784863.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb702f8c---vonukegurimoluneb.pdfIn PDF document text
    • http://www.bandungmesin.com/file/fijiwumedokivajisukane.pdfIn PDF document text
    • https://hgb.se/filer/file/56564444256.pdfIn PDF document text
    • http://www.ventisilva.com.br/ckfinder/userfiles/files/36711887504.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b325547d36---kotesaxisogobe.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/nufisinufuxojupeber.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f06a09ee---kepodetoganijofuzifeziwod.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/53422394329.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d394ab1---bitozaxijotoseputijid.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/kibebofenitel.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f24c4b0e1264c2e7b01521e0b1f0a5d9/94213857553.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/35958161669.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/852c06c2630085aac32c59e5e361101e/vonusis.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/sifasuzifutodopemilazuvop.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/simodefanegamiji.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010ba489d7---jukowabarot.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wotusanojezorona.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qmjuh3bspd5ok0q43l6dc84dbi/12923796951.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/75990894337.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/12010368113.pdfIn PDF document text
    • https://areicon.com/images/file/lerepopan.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c568b85208---72981154897.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_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10980 bytes
SHA-256: 4b60ba135664772cb23bb9b0b6903083b227bae677c2c70fdf840a529d7dc0bf
font_01_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 18992 bytes
SHA-256: 1fc93d834df191447109a87d4d029eb0f39d43f8f1caea8fe21613c94723138a

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