Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed7800914a70c79…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 22:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48198358255c0b0968f717dc254115eb SHA-1: d2d8f1c26029b514a4961bcd1430ef2836b71853 SHA-256: 4ed7800914a70c794c3bd4a30e00a71da5cad8d569025b3adca9331f2bc229f5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, a common social engineering tactic to trick users into clicking malicious links. No scripts were extracted, but the overall pattern points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://brianhigbielaw.com/UserFiles/file/fejupi.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d855c5f94258e5963138d8ec92ad729/wexujipeworijabijevup.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/vuxuvodarikuxukevotuloxa.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/2706129249.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/savubiv.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/ruxebojaxirugab.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/50138170097.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98160867491.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bjuq5p7vroiph13rnks2m8e0hv/19923062942.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/womaruzagutisiwe.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/91759300477.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5802927a---lasatugobasili.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/86120293634.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m07gchm73l7k4vv11dn52jdfd4/xemukilulotofiruwip.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/sogizu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/87099854668.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zirorisinupidasajodezuro.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/50110452390.pdfIn PDF document text
    • http://qca.ch/userfiles/file/3956379264.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210902184306.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48172463343.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612dca3977844---72997831658.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2um5v8khffntq1kibceqhsau2e/45656629059.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714f4e291dc---digajivo.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/zexixewuw.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/dalimakeresotu.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/24636909919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=spire+pdf+print+settingsPDF 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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10420 bytes
SHA-256: a8d607c510f7939b1014768ee9f0ea215c7419e4b227b492c4639edf265d578e
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 17772 bytes
SHA-256: 98a13c768b3d22f1d3fa8db229f46a5ae3a9e3263cb567a5ff7c38d3a00db760

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