Malicious PDF — malware analysis report

Static analysis result for SHA-256 722b5cdcc4220058…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 13:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 817ac4c2521d7709d65ce9f1fd208db4 SHA-1: 89ff7f0c671c7bd36b018861516e95b3887d3a0a SHA-256: 722b5cdcc422005898bf4eec98a85c1af44679148c9f03f3dee56d6eb930bfdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious content. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads, suggests an attempt to redirect the user to malicious sites for further payload delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=trumpeter+catalogue+2018+pdf PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c745a086e6c---45612209030.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1e314a13---dawabewekogunobow.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bbd31aee1---muvibusodiw.pdfIn PDF document text
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/75e3fd39f07a860bf127d0aa14e47cda/45905690980.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/71294878340.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/80378705619.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/28171303190.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/12884944095.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ea45cbf7b02b6861acede5488b2bd000/juwepiborapufobibe.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021080822185829.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a649ae2b07---39663825121.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bumete.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb89a1f3e---34682860529.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b18fecc77---51232746178.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6qc0chg7d36skqhbflokfvnitu/15134841020.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/71989607105.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/1215095645.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/54409130971.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/pejelem.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea8d817---turunerogula.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/89084411810.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c707415cd---pojubutegameloboxibidovul.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba6f0b16a---25197154398.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/61771959628.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_off0000b933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB933 11164 bytes
SHA-256: f4f04fd1221ea53fa89e1de82521449870b037c9d0928c1f2f3daea83648806f
font_01_sfnt_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 16780 bytes
SHA-256: b4d1f8e0b66da83203746de96ae114f2f815f34e906986fc4f8ffd89534d8311

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