Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98562bb102880e5…

MALICIOUS

PDF

95.8 KB Created: 2021-07-05 16:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c92983c1446126d3ed3f33d1d1a5231 SHA-1: 3d9cf057e8be1e32ec18d72f3d36c89f47aac910 SHA-256: f98562bb102880e581b0af2d66155f0e959eafd38bfb5713d0c9e70c8a46ba17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4295f9d1bc---nuxowakajerazi.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37c1b7f6cab7dd7649457129a4cf11f6/xuwanusokedikutimivoweju.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/765787385.pdf
    • http://gursakaryahukuk.com/images/file/15448233628.pdf
    • http://atenngo.com/admin/sites/site/documents/36808739943.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/edfck7erm744690tuceq84n9s2/natovogefisuwigubaru.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79d5279c6---70760152715.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/144d5dc3c5b36492443e0703460f00e0/23843589672.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df701d0f34---ralejuvupexaf.pdf
    • https://aulacvn.com/upload/fck/file/totez.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731dc291bfa---xabizonudepamagem.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6524251971f146c0a54d6109bdfef01e/mesimipidezokasivisupedur.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8f09e03ea86b47ba22481b6be5737e26/26545806189.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/99987862863.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/343fa20eacdb57328ca282b723a38367/vasiwokubawupadapibonajo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f30c592---28445741647.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070adff39de1---9961748782.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/557661e441df855274168316e1e23b5a/62291881245.pdf
    • http://tlxzkj.com/uploads/file/111354158975.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84ba31830ac5310ceea7ab473766680a/50538859718.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/xixulopot.pdf
    • http://inspiredindianfoundation.org/uploads/vagakagelifeguz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reading+comprehension+with+multiple+choice+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112f6.bin
9cc773cc5c0fd94cdc74386ef93a50257d44a7549738238e7d0fe3138d5b0a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 17000 bytes
font_01_sfnt_off00013f81.bin
4c9a29c1f35f7f559162d3172bb066e94f935cd21385c2792e40de80656f1777
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F81 11336 bytes
font_02_sfnt_off00015978.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15978 16792 bytes