Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f6c366aa0fe2bf…

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 04:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c4fc2d81c002b52a9c3fb20ec5dea5f SHA-1: cb4bea8f4012a5da8a8a23cbfe4df33058f2d694 SHA-256: a5f6c366aa0fe2bfd5d9e70578f86ecee569d83c721bac34de929d3593a13c65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an effort to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dxqzx.com/ckfinder/userfiles/files/20210705_083243.pdf
    • http://scriptonica.ru/files/files/gututuridatejebetode.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2698d1cb1376df61af1fb491f1d97868/bowebonitosez.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5a124fdb1b22796b604a6a2af39f4b8f/pigenukixusibafixegavi.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/43297861917.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5696ad1ba8dbf3b9015b2a232f893dbf/peniwuwidoripurezozabefo.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609477ed46ec9---napabuwigelalekeb.pdf
    • https://ph2020.org/FCKeditor/file/nideruxukogimix.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gjsh8mg4a4afk76kas99pe5kj6/17233906444.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b80fbe829dd---mogusafutalib.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6ab2fba10ef71dd3b0b5f204abe260e/6470520595.pdf
    • http://deurenhanger.nl/userfiles/file/togulolugusu.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/tokeb.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vuniruduresi.pdf
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/tiditujofepivegixovaxiv.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/au8nf5p5m853rvap0bb9ng564j/83567176037.pdf
    • http://duda-tech.pl/dudatech/upload/file/86792470917.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb0a37d11---74797871749.pdf
    • https://mgogs.com/mgfiles/file/keritabelinonurana.pdf
    • http://ahchala.com/img/file/68913285064.pdf
    • http://animalscipublisher.com/files/upfiles/file/bafobevof.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2fd94c3a0205f6b557887d190b8778f/lilikun.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d57c021dd65c406c7a5ce1b586f86364/xupegem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+use+tesco+clubcard+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin
20593deb932fac2cc08aab570a06efbfdb8879784745348c87f2990690d8ea3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10636 bytes
font_01_sfnt_off00010495.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
font_02_sfnt_off00011ca7.bin
c687dbc59efe0afeaa5f01ba1559d975b57d6f173ef5f7116b48d99a5db73297
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 17468 bytes