Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aeba2a686e3fb5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 11:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 363d717ac116b25c901615f8f7481ea0 SHA-1: e076144258e5b34449ff3dd74fa4c452547678c6 SHA-256: 36aeba2a686e3fb515b58a27c17b820cf67ba68989016b546640f2f8b1352961
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm or hosted on compromised CMS uploads. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the overall structure and heuristics indicate a malicious intent to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=bus+simulator+indonesia+game+download+apk PDF link annotation
    • http://feynburg-uhren.de/uploads/48183543362.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/39060091249.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/7259131168.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/66863048956.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/12342418631.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/78677566990.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/16813522691.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/37762642464.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/97058296484.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910200517.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/vulen.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/mubijufaroz.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35315236784.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/37a5d3f1d9a58c2b8ab02efed1c7cfac/62756697547.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/zivebil.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1a8869910b0cf4188ffebccb1d1d6329/gedefugivovakefape.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/49298946483.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324318b8e8b---xewulumefujemefamup.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/66431395520.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/70734096194.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109040953349000.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/woneweminotexetuwawezoda.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 18568 bytes
SHA-256: 72cdc61ea39640ae027cf804ec48d55c718afc569f31cc3d650c360ca672f7c5
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 11064 bytes
SHA-256: 173c021a63422348bb3f9f7f1f4cbf5581407faee928196b46d69c55c51a6d19

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