Malicious PDF — malware analysis report

Static analysis result for SHA-256 071913a96663715a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 07:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9a3e1846f5243f319f2ee62b440a04b SHA-1: b423d7a96224c0dd0f76945749e67e608162d4d4 SHA-256: 071913a96663715a1d15b505c7bc3465179b02f44ad5083e1416649f4a4f126c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80akazwaeiw.xn--p1ai/editorfiles/file/zajaruta.pdf In PDF document text
    • http://888spirits.com/userfiles/file/10354474251.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/38522161636.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39c72ef3c---tifuxejuxarazixa.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109150558327690.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fbba16c4---7486158062.pdfIn PDF document text
    • http://halaljones.com/uploads/files/sesezimurosumetefipupasij.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/5593555681.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/gasigutaf.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lekiwifenumepawefunuzebo.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kasutodak.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58563589419.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/dipenelex.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/wedabiviraxuzijaritak.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76777ec9---pozixaxanevovaragudunaxit.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/84153066434.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/55318811839.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/27812250906.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd69584cb---64120249409.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/64472799370.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/nakituwenekulenesabo.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/kelij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=transfer+text+messages+from+android+to+iphonePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/57167266299.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_off0000aedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDB 17380 bytes
SHA-256: f8e201e8e95b3d579cb583764afe33be225675a02b3afb7040f9bcc10535457b
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10964 bytes
SHA-256: 219284be10701542a0233ab5583257877a429d592b6c19240724bc36b74c60c4
font_02_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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