Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be2b47c60ab8852…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 05:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641c0afce1db75fe964ea3de5627fa7f SHA-1: 5d673f53a7a0924d7b68026a5ef5ce0f427c8b92 SHA-256: 6be2b47c60ab88520782d30de33858e9f58c3f27aebb4aaccedce2a7b78aeb43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves tricking users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://toonesk.com/upload/zodedisuwuluw.pdf In PDF document text
    • https://weeb.nu/userfiles/file/11109779092.pdfIn PDF document text
    • http://wuchem.com/upload/files/besepatirevagopasifodam.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/nepekoxufagawuzojewi.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/tujidugoboxutobumogexeno.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43953819128.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/46365057130.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/ridesaxibosakuwamagem.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/40852729013.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/isacmtggr962r7umi0am96ssl1/tafuvosekadax.pdfIn PDF document text
    • http://fotossc.pl/_files/file/ruwifiwunuwenofemarobinuk.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb691048b---zoweju.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/71116264982.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/nareva.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/61491741343.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gisasavazejuzosojutabile.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/93247766163.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/48c1435c661da579ea97bf4051242132/70407654305.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608446c15312a---fotikafagovalulifij.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/83037785844.pdfIn PDF document text
    • https://congchung7.vn/upload/file/zariraridomekobekevufuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241a00b492---47911420747.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4c8bbfdee---73515019388.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/47625498634.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/83372423325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=parabola+worksheet+with+answersPDF 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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 16056 bytes
SHA-256: fa9ef18c38b4cd72b96cd652581c2196c01c8e1a3a1dcf6da4d2ef54c8b1c5ab
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10524 bytes
SHA-256: 5bc9dd2d43caa9306e1da2110f54b486bb854a565fa9fa81a68038295069ce10

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