Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4b3286d92ce69e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 19:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c353ad9795bad42d4234faf74f5274 SHA-1: ae7191bb4bd62814d19b4ec8710bd0ed99c12c80 SHA-256: 4b4b3286d92ce69e1b3399a775d416e8d26d5b7c75ce89bcf9d08ef550db049f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress or other CMS upload directories. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=contra+apk+for+android PDF link annotation
    • https://babetravelling.com/ckfinder/userfiles2/files/66966647146.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee9c4fc1d---61551486724.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/38245388576.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/04b743fc20a4d2c38037f3a84319db34/913076561.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/75308086361.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/dozazevol.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61454636273.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/99176353051.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/40732569095.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/34135660828.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • http://otczenacts.com/media/files/33912639278.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/05/file/gemapezosakimijazazex.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/80849162337.pdfIn PDF document text
    • https://sainaudit.mn/File/podisamanirubifosusivef.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d904930bc722fb8be02934c53905f06e/29414603871.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161308a8f7d563---pamapiz.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613761a344519---6488603478.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/39270015399.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613604bfe12b1---80742337208.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xelazevinenij.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/23972099628.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/20757726506.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f448978bf---wapukirelekozibapudunili.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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 17132 bytes
SHA-256: 2c303d44540ec23fcf8fffdd316484f46c2049b2520e704e77043681a0081f22
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10268 bytes
SHA-256: c7e73a33e0ffcb6156d6292ca6088dacd395cd71c7dcbd929a3b60030043d532

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