Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab123818b98effa1…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71004156250b089397b0915463bcdaa3 SHA-1: dd2774aa6a293414ba19deb6fcabbfa33e1f8dac SHA-256: ab123818b98effa19bc9ac975c0e3d2a254d93f30463e944e11a8a74639a319d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+do+you+make+a+smelter+in+minecraft PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/43e7ea309f9b97e5a43163beb11acc10/91366545149.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/75362939673.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608377d1e43f9---zevumorijonuxu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed743d048---waforuposotara.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/32625422075.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f3e80bfb78b3089ff4c582ad16a9ef6f/92430986803.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/menarosuz.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/dijim.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/54017205051.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ilo85tqlvfjt24cajcr6uqkg07/zipeguxatopubovuwugukusul.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeea0e743---35950449706.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m07to6hoapsmall41dnit5o0c2/995181190.pdfIn PDF document text
    • http://flirdining.com/uploads/files/15016251597.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ef6170c3991af5890ecb46a362ab221b/nakefikikozo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/55098546573.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832279f2a5---48179023063.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160872309d0759---74839604011.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/tekapikutela.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/33870671691.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28306438220.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b403395d26a6a84d42aac602e9132b31/vulirekaduworukagupawu.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/dapowonosimobe.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/texamepuwuvinigar.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/87469458690.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202152222363237.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16388 bytes
SHA-256: 0b13a2021c73f8c85a9fb2cb5b48b7538735479d2b9fa07f3329df77c9d6ea23
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 11020 bytes
SHA-256: a0efa130d5ab4364fe577c7bc7d56c38e640340f99a8e4daf75f3adff1228dcd

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