Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e699a9d27b9cd0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 15:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 798e01f920edcf8c00ac3f94561acbd1 SHA-1: f7e48148bf0f6d3d44655b97457f5b3b633aeb85 SHA-256: 52e699a9d27b9cd002a16663233da4a04e23a550c739ecdbccfc9f704db545e6
204 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely executes malicious code or redirects the user to a malicious URL, contributing to the overall attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://wastran.ru/uplcv?utm_term=trilex+bike+game PDF link annotation
    • http://remaining-mc.de/userfiles/file/75244085998.pdfIn PDF document text
    • http://tianfonmm.com/d/files/karixusazabex.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f23a53780---wamagupeziwe.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/xusigufabis.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/18186652653.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/jumitoroj.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/96570792204.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/15134983504.pdfIn PDF document text
    • http://4bx.pl/public/file/28229329359.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9t3n4kedfa9pqcs8rpl85af619/66435298636.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/rigoduvupijok.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/manadopafopowojikajobis.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jixukokasewexen.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/birezadowadepupaduzuw.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/salarijiwijabalo.pdfIn PDF document text
    • http://cartopack.be/Images/file/88353152898.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/batimifetavorosarenexotuv.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/198625687038ca16b4287e6f581f9b9e/duvututotikukelitepeposij.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/gotare.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kafejomo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/suvugo.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/dotanipowon.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/63396730373.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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 17412 bytes
SHA-256: b83301c2482b374413a5c380d3f8d7f91c6f71696bdafa116190132f0434c851
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10256 bytes
SHA-256: e0329cb7e4c92aa43509383403f6544bb1d3a736d3cd41235c1d498bcd2e2a88

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