Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f4cda28b119e4a…

MALICIOUS

PDF

105.9 KB Created: 2021-09-03 03:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f05b8846bec6df83356f543fef2ec93 SHA-1: b0fad35010e995d0d71f1a51a5c5c8b9f91f6b08 SHA-256: e1f4cda28b119e4ab0dc32d61da3a30c235ab095223efe7c61b2d8de31642ec9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The presence of compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=lecci%C3%B3n+de+escuela+sabatica+cuarto+trimestre+2019+pdf PDF link annotation
    • http://biotop-zamosc.pl/userfiles/file/74001926008.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169ca0089dc---rabikajosijufowafafobofaw.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5550f27d---powefidiwosumowojatesul.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b838c12f517---13056121864.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/biboxifoguxupofivamo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d245e59224b---xerapudiba.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/002f41627967aa97504402aae4503524/63735871506.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/zakosuboj.pdfIn PDF document text
    • http://imi.vc/upload/files/68353858745.pdfIn PDF document text
    • http://chieucoingason.vn/files/rakefizegugagimugatow.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/xasepatutabejil.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356582a6e3---xamejarodizebojowowu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9802f050f5---sudinizuzoxugida.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b93b566442---50927566572.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/510ad53c647408f89881588f8f44370d/nikinalomibom.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc05c10e5d---32152528315.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/femudebeg.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec14638f9---71985019524.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/52895395359.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/xunupatuzewafugukojom.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nakinekonufovudikigezufiv.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c822b6898---bosikune.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_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 11580 bytes
SHA-256: 66dd688c16f01fd135fdff645499566ea97801adb6ea670dab1f4b06d65a9235
font_02_sfnt_off00015fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD1 21684 bytes
SHA-256: 89d76ecd3b24cd3ca03d052a146a3b769ff0878ce5270a55ad526c0705d1e4e1

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