Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c9ffe629081a15…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 11:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d4feb589b834d363d656dac524f59d SHA-1: bf53012b42ba05ced8a46de7cb98989802062844 SHA-256: b5c9ffe629081a1573d778c9202c88e977d415ba125f3d485ee035ed57aa0e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for phishing or to download further malicious content. The presence of multiple compromised CMS upload links further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0c2e5257b28e954a5e92434cec5b2cd4/disugonudazotawewivoxuza.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9c1a551b---televodosesujet.pdf
    • http://portalcom-b2b.es/img/user///file/_0143085001619900386.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/78e85c798e7dd060b45297e301d6a3b5/rolerujowepixafetix.pdf
    • http://fogathajtohirek.hu/fckfiles/file/17418760567.pdf
    • http://sllight.ru/design/img/upload/file/lanezokupaxetog.pdf
    • http://ongnuocdenhat.com/upload/files/zosekaxapukukoge.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b27be1f1---funemupil.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/zesimulogajusodeb.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c971c7e80f---72907606967.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/kajetitag.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bd3178a27---21050844049.pdf
    • https://moto-trend.cz/public/files/fck/file/82449808621.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/s11mib0ar65isg4u9o38jmd21g/96867165202.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c07d7217d---3821346813.pdf
    • http://ctkupavna.ru/upload/file/tijelasonugefofatoxeloj.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d6c4e099ea5c8c375a8a54c56c842353/43251099206.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f595cc790a---1191394472.pdf
    • http://candientuvibra.com/images/file/46444421649.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/66060c7ad34af72def6747e3c128983b/64270442747.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c573050b7ff---67695726923.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3934cb3f---pofamapusepifudexawafafe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minty+pickaxe+code
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8c.bin
849d42b04e1d69ae5c67a6573f2b42f2fbe31b52c643b1db48cfbf57f5f2a582
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 17268 bytes
font_01_sfnt_off0000eae6.bin
0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16416 bytes
font_02_sfnt_off000101a1.bin
9380610fe221c386e3cb2542d5cf09361a348354225d120604160f786a35a970
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 10492 bytes
font_03_sfnt_off000119af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16792 bytes