Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4f7218838bf831…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e91b351835dbad99939de3d79b5ce79 SHA-1: 64480d40ddfea99f91cd70496d8ccd87e91b8cc9 SHA-256: 7e4f7218838bf83137398e58c495c0fac8d98e3292ec857bb2a6043799c7dc7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to various compromised websites, some of which host further PDF payloads. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these malicious links, likely under the guise of an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=power+of+attorney+for+rental+agreement PDF link annotation
    • http://hkacca.com/userfiles/15719922600.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b503e32dd011c4b0d062442a8b9726f/47054720163.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tarisebudasupiduj.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/kqduapibmauurl8o2atftbm744/jedikusewimumakipaba.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/28069735695.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/dexurejaputun.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/67076786177.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae2536317---73259114688.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nijamonivus.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/34029118588.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dtk2aogj61jtcp6jcjb9aips2h/rapivapus.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/97158371465.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/18167073663.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/62433403787.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d41c52d9bbfc81e6b7c023174fc88486/zopeja.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a994a348893---30386245053.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/segede.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/53a2880ac692bce1380b2a05d16d54f4/jabebokojuromijamel.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609890de03ad2---79638760789.pdfIn PDF document text
    • http://hodori247.com/uploads/files/fovuxagotapekitapakoj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715893f2590---saxerumogafokon.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/86734117397.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607063f986a08---55920780549.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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16800 bytes
SHA-256: 9e4982347ad509cc72d6de914b2e0f242a848e8e3cb62c8b4ee6abd8abf07378
font_01_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 10496 bytes
SHA-256: e3a570742db75523eb70a8cdacacd31b361e4956058b7797fd69cd747905eb78

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