Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e41a2716d62233…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 21:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f7fea2548f1ca6a5fa3ac65148d06d5a SHA-1: cc4b4608a585273a6acdb8a58b0e956eecdf4e07 SHA-256: 65e41a2716d62233a71fea7341b92a2aa27e65a697f23334dde978171df87a39
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://vuonlan.vn/data/upload/files/bogazexutamixulekiwur.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a821b56b8ce---jurigokidavuxa.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/wifemelikafenabureli.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a32a077bcc---junoj.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff1c8d2c24---35677290979.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wepefuxeterejumisemiw.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff35657e7---wiriwomopudonubud.pdfIn PDF document text
    • http://dominant.name/userfiles/file/dutodidikivisusufavesugu.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/kelimon.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6952026942.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/21337963126.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91ff66349---silomixamafijazobila.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gaveluraxeten.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/15905759904.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609763ac3ab51---63569097460.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jedajisuxalanuloxud.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/61032058913.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/55249637079.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609344830e286---67639602399.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/92737287981.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jinujakuwet.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088398a59a7a---wunege.pdfIn PDF document text
    • https://iwistw.com/upload/files/nixejenivenudomomet.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/zugafuwagokoduwefeweti.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608242a901924---22712074307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lullaby+music+mp3PDF 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_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10464 bytes
SHA-256: 89544f2c4d30634f412b050c53e2cafbf60b4a5ca94f09bbadafe5b358230238
font_01_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 17728 bytes
SHA-256: 1ac34fe6ab0e8e87dadec1a202b04e5c70abbd694b9fe84ded87c331eed3df13
font_02_sfnt_off0001465d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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