Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c51404c79785e8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 02:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 559bc7c51eb726dc8e2c381741d10033 SHA-1: 7db48d2a1f3d7e4553bd0f4995922649d308d5a0 SHA-256: 55c51404c79785e8e39e2e20b8ccfeec692ded9687a3642b2aa9ebefeb339c5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://technoauto.jp/js/upload/files/bajugojuxilunaf.pdf In PDF document text
    • http://ahkjt.com/upfile/file/28599341260.pdfIn PDF document text
    • https://priscar.com/documents/files/44960758001.pdfIn PDF document text
    • http://teifsepahan.com/files/file/14530132184.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69jj11d8gggahf6mj1kvhv831/25855956587.pdfIn PDF document text
    • http://ssp.by/var/upload/81031281341.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/93567524521.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f5207d5c998bc0c786760dd8ef8331a8/kuxudosunejudibur.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/61598741308.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/nofizemawiselumifizeva.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecf4c7673---59523458832.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/66885908074.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca4972770---kikoziligafib.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85a47bbb2e---rigovujepozanuresazibog.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/33734660330.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a5306d3b---zaxunitejivulodedaw.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/31579078909.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/41f412481f3e16934fca4d5ff1cb6367/fanopodovitagoka.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606d636ab1f89---1182834866.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/25494389198.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df9c819fd---rafifepupuwot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lenguaje+c+para+microcontroladores+avr+pdfPDF 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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 11216 bytes
SHA-256: a29bfbdb8e3d1fd1cfa97ca4788aed1966ad1c227ce05f0cf9b952f668054434
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 19504 bytes
SHA-256: be63ef8c080a3afe8d72ff9bf53ce8d3e97fbb66b8442fad51c8a539530c797a
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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