Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef71d78eaa0418b0…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 18:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51025a111b087a2a51dc454e7607569a SHA-1: 7d7459526e6105e27f8139367de6c7e062a26284 SHA-256: ef71d78eaa0418b0f823a80ad8807fae98f165f676289a01c6609082a8c473f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, which in turn host other PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f7c2da79824ab1596ac2b360cf5b82b/kojisajezoxozazopag.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df310254a---88698386102.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zobaxavuj.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f0si7al6ft3b180h61qhpe8t44/46322783903.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/29386330674.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108232233539471.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f37da3f5b7c7e8bcac945b96e11290a4/liwuvigajizowekofepafo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/sajibofedisirawivolakawir.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3f0d829e3f632a6ffb6ae04089af11c4/92545690705.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/lopusivogudis.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/64128398832.pdfIn PDF document text
    • http://jump360.co/upload/files/20210823210028.pdfIn PDF document text
    • http://superbarter.sk/media/file/denazudajufober.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bavasagixufevajedawurokuv.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/kajasejodanijubexutonasuj.pdfIn PDF document text
    • http://splogservice.ru/content/file/tozovuvelokuvazewusipuw.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/51637891953.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sl4r1ekrsha751osc07ag5eeb6/50980570627.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/88271725221.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/wenusubazod.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/jowenot.pdfIn PDF document text
    • http://dzbnf.com/upload/file///daxamifomujewupebunaraje.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0399659fef---koxatitirirebitiw.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2runopnuki5m0l868npeotc403/mefurekipiradoma.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/fubibukuno.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/45903331201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cocktail+drink+recipes+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 19208 bytes
SHA-256: e67f2e66fa0c363ee68448d8c2c68787576c879bed56d2fc3a61f844d832d9e4
font_01_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 10736 bytes
SHA-256: 3569009097a04c7e5243fdedec8fbb1b573b81a16365556cf908bc7c9ffba480

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