Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6631e1c28b9c00…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e28e03de3cad4ca7df13b3685436d542 SHA-1: 7d31bce5c14fe8e965c22ebecaf7dca82eb699b0 SHA-256: 9f6631e1c28b9c00da8b532e75cf1f5d3f5cf3a55bc4dae4e04bc3c5dd9f4592
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or point to compromised CMS upload directories. The presence of embedded JavaScript and the link farm structure indicate an attempt to redirect users to malicious sites or deliver further payloads.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://ciba.lv/uploaded/file/luxamaxumajoxoferopuzerel.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/buzubudimujixutipawij.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/lejupi.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vawot.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/19693418674.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/vakifuligel.pdfIn PDF document text
    • http://thietbinuoitom.vn/uploads/userfiles/file/24098244200.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nujiwamezeliluxeriroz.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/83407356829.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/sadonisisomulefipikibuwax.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3496ae15---58515277472.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/ruwufozagerujiripov.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wimogudoribidog.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36b70f3a0---dewipozenufuvadati.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/48544572146.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210929_14AB7B17F4584A5D.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/23045116508.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0a4fe6b5f8f4a424705bb1d886b098cc/92423007390.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pobilaxitenatoxaju.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/68731350581.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/93935572201.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/87330714990.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533b13c81b---pewixijomebiw.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/60729912776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=1080p+movies+online+freePDF 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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 10612 bytes
SHA-256: 50b219a1e58dfd1a6fc591e9c434836e94279211cc1059d6a18cb63c60183414
font_01_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 17084 bytes
SHA-256: 9bbaf03e33338a9035f0f1c204deea1aba33b1c899742167cb4455efb1d079cf
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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