Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faa776b4363c05c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 11:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6903a5f630bb265cbe419ac5321f1ce7 SHA-1: ef18113c4f6e29c7cccace63782784da08ad5bf2 SHA-256: 4faa776b4363c05cc49b55facbb39a7fde98111d12e441dc09d2bed7921cb842
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of distributing links to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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=gavotte+from+mignon+violin+sheet+music PDF link annotation
    • http://studiopassarotti.it/userfiles/files/62760938646.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/dixepitipowevix.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210914_193037.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/76986270113.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///62677737651.pdfIn PDF document text
    • https://psicologopsicoterapeutaemdrtorino.it/uploads/file/11641811781.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/8793740243.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xakekuvikiw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1c658e97e77b8a9ae83d74cdcc3680e4/54666168023.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gamomonugo.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/nefetarexotaka.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/20813751081.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/porip.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/deroridonugafowatumufoz.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11d45f082---suwugofipoxopaxusutovix.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/85592011638.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/xisixofukagemikelafuvasa.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210916115254.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161496b108b617---14868028046.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb875a604---xepopesavefubuvevakebo.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/33282886359.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/55981842075.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/tijajuxutemuwunigoj.pdfIn PDF document text
    • https://ccskin.com/geektic/files/welibuwumekaradalizur.pdfIn PDF document text
    • https://mikludava.lt/images/files/66980096843.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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 10988 bytes
SHA-256: 46aecd4749e077feecafc3bfc5b612c9a59ed8b7928f1d6b1be569ff45c2bb0e
font_01_sfnt_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 17140 bytes
SHA-256: eb1ddb9d24fc80b4be99e4852e3d30235bb5d28424b9ec6db2d10941b411b5d7

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