Malicious PDF — malware analysis report

Static analysis result for SHA-256 85014dc2af825de5…

MALICIOUS

PDF

88.7 KB Created: 2021-07-18 05:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 374bd6ae9fc9f89c7bc6bfa75a91ae55 SHA-1: 7ab9a99b883e3b4ff8bf0241932707b616b56594 SHA-256: 85014dc2af825de5b1521b249c72fc45817e101d461fde1ae5d1262b80221e9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This structure strongly suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ea41df159cc128638d9d6bf99bce377/48358565868.pdf In PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kusugonibafuboboxewonir.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/36295535298.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4rprhvfuiinc9lfkrevej7u09u/15994740470.pdfIn PDF document text
    • http://bptramptour.pl/files/file/67288670247.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d7aa0ee4---44946228430.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83412013363.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-15/images/files/33379388959.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/oghfakno5ppb9gilm0qtrsp6c9/91735939434.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5919a76031602f701a15ec451e5cdaac/fenixerumomamux.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/43114524500.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/rozugip.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/12494459881.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vumuxuxe.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2320187600ce7bb10f0486e8f66f4f78/jerokexasetavexuveju.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/8210624556.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/gunewowameselafugoge.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pozazave.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/27040979295.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7d996d9d3d99907f3e7f601dbefb6054/30426780094.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aaed9d815---95009391027.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/95652057297.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202164108293392.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd51e1d54c---2909578120.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pabijeselokozapumu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a90e3fe3297df647f5fd03ac6e42bbf7/xuxifamelaladuzonotefisi.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/paxaxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=urethra+in+a+sentencePDF 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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16720 bytes
SHA-256: e38549bd5d49a970774e851c7d784ef00e9ef8a81bfb90b73d19880daf268352
font_01_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 10168 bytes
SHA-256: 34480ab0fb8f82d62d86303727fa0f5a462ad57583e628ec601c15adb400a771

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