Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c768c21e9c2d046…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 21:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ba98239adb2a8859c17f5e20b68a186 SHA-1: 1dc371f3cc11fcec59bf1aa8bb118b51b64c6eaa SHA-256: 9c768c21e9c2d046f758fe11da16a8f90a2c554cf28e907bd54a7110711e66fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=solution+of+physics+class+10+icse PDF link annotation
    • https://fanaf.org/article_ressources/file/56063175286.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42142182808.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/89836972136.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/170dbd8d90f4d29ce97ce4244476a1fc/nutofizamejinuruwapadered.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/25803109292.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wegumusuwizikuwawagiwego.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gapurunazusisakage.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396cbbbaa49---sawaduzexelemepororo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416180797e5---94199301332.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/lededavokularuwubonazar.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/69802108908.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zuxisugek.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea43d3bd68---96139608442.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161421fee8c731---62455696396.pdfIn PDF document text
    • http://konberdbio.com/upload/files/7256064502.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0907/75c205de80c66ed0f4e4bb4978de967d.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nawugimigevaxomibifeg.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/090594e7b7cda88ce5c53424ca9756fe/21430591171.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/89130629703.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/tasuwojitaxiri.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/tavagupa.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/77807913924.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/84043047776.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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 10940 bytes
SHA-256: 78ca90dc27059f891c0eacdb1b9e56d877e30a80d8728fee85a76bc7fbaadced
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 15852 bytes
SHA-256: 41443a4c983554fc9cd05629803dce4b8517ca329fd3ce7f9bfe75210c24807c

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