Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ae3b2cdeef1d6a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 06:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d9a7470ecba598dff7962016f1ccd9c SHA-1: ab5b5f9213fe288a5ae4ed27f7ae0713c510815b SHA-256: c3ae3b2cdeef1d6a8a4b34a96b431906868f06850bed39f3dcee5953182b1731
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on potentially compromised websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6901eaa5bd4165bf67f7f34a6f5c00cf/27088652723.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2070e8d213d9b41b902eeb505ae9a732/89819278802.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/10076519364.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/99008873750.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/46638955584.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7971befb73d104483765c8fd333dd41/31298869755.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/42048357626.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210710_105838.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///70727710773.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/551c96860b99a25eacfb911615f314ff/bezaviroputu.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/1525788646.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/73293999339.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/91859872774.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1bb976fe9ab0b72d53f7a2cd23454c29/medipesimaken.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6mmg3rlinmtk8frl31kut7jd5f/duleripatoxumaxukow.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/21545839597.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/minamabe.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zubezepulakizivepa.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/42183196566.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/83327938666.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/tofepuxu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160948d9044768---36103851482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+a+chinese+abacus+pdfPDF 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 17700 bytes
SHA-256: cd914f9bc5057eef879f97aaceebaa2753f3682723aea990a614a36f225f0ff1
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10888 bytes
SHA-256: ff73490c97ba2da794e804470cb51df4740622013661c99b8266e10d97677651
font_02_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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