Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ce02e05424052f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 14:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbe85aa31aa2ef24b352cf8ef184dfb4 SHA-1: c3df0336bb5ae307766de105728963a3b79a630d SHA-256: d4ce02e05424052f94e107b9ff69b6e7da1094d9b4f8c74340a359d0ccf30f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were found, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d19952be8---wetej.pdf
    • http://jinyezi.cn/upload/7426332094.pdf
    • http://puginternational.com/ckfinder/userfiles/files/favixope.pdf
    • http://jtour.vn/userfiles/file/657597476.pdf
    • http://dunajecbiala.pl/upload/File/bigeb.pdf
    • http://doyen.cc/images/upload/File/11487505421.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g8a9p09vv1knblg9426k2s8ej6/zavupeda.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/4521996654.pdf
    • http://lamdecal.com/Images_upload/files/63191148773.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/85976735545.pdf
    • http://www.toeterloeh44.de/files/92208165874.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/q9ecqgjncb6g89fn4fur7tgfk4/pinunanabotopifefixarami.pdf
    • https://livnica-metalurg.com/images/pages/file/wuzusojifode.pdf
    • http://exosushi.com/uploads/files/vibasetiwuzuponoge.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/15cbea03f20b16516830859958762a84/11020255045.pdf
    • http://self119.net/upload/userfiles/2021/08/files/210823181046.pdf
    • https://congchungnguyenlieu.com/uploads/files/pipoletezekixi.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b384846f275---luwawexedox.pdf
    • http://indianspringhomes.com/userfiles/files/38026534718.pdf
    • https://travelworld.ro/userfiles/file/93822150878.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prawo+ochrony+w%C5%82asno%C5%9Bci+intelektualnej+pdf
    • 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_off0000e95a.bin
ac3f353d74e955c5b29cbbc7580d7af5a649754dce2d8e68016ed331f8023570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 17888 bytes
font_01_sfnt_off00011637.bin
f7146e2e288c6c8a1b04b1b9c4955b934113bf6b7d4652266393f25e30a19a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 11496 bytes
font_02_sfnt_off00013114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes

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