Malicious PDF — malware analysis report

Static analysis result for SHA-256 b869e258cdbfbd11…

MALICIOUS

PDF

112.9 KB Created: 2021-07-04 04:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c37d9992b5b6c51673b85877538647a SHA-1: 7e24f5b161aaefe87f28274ffede3184dd3bd729 SHA-256: b869e258cdbfbd11a6a08e6d90e61990bd5299c47e6d5f718207d0e49aaab8bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c027614ed41abfffde65d44dbd0e21a0/tesegukijenaf.pdf
    • http://bensonlandscape.com/editorData/file/55440162097.pdf
    • http://feach.ie/images/uploads/file/kazesozubelotew.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a30f747---84074629914.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8e83e9b42c1c530418dd1754403dabc5/dixosovotepodabuvojinat.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/nitutuxoregan.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/43671991862.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3aa89b2e08290b6ab49b2106ff44389a/97083647548.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b1bb016b---45492215793.pdf
    • https://ringid.vn/ckfinder/userfiles/files/40672720818.pdf
    • http://frezerovka.by/images/fxeditor/file/42093122209.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/3koo305j7e59rkebgc4803u25v/rabusafin.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/junesewutobusiba.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/khr00v82na9snl7ksiu32i5hvg/25127248227.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638eadfaf8---2173631159.pdf
    • https://windsbs.biz/files/file/31410545764.pdf
    • http://derma-dts.de/files/file/67322445076.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a0645f01---31796096962.pdf
    • http://smn68.com/clients/75339/File/35957794805.pdf
    • http://jjmcp.jp/userfiles/Image/file/bakijun.pdf
    • https://tepihtrava.rs//files/42963021817.pdf
    • https://inncredel.com/uploads/55251066916.pdf
    • https://gyandeepjkss.org/userfiles/file/37731195923.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210701_6A0AC6D2CE38EF92.pdf
    • https://lescourailleurs.com/upload/editor/file/vawomez.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jcsoostuqa7vkq3npgktaahvms/sabuluzuzoluma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bull+terrier+and+pitbull+mix+breed
    • 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_off000155ed.bin
e560a4584a6bf6cab258f87cb1012b6fa60ce7b8c95e803e14df8188ba5ffcdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 10660 bytes
font_01_sfnt_off00016e0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0E 16792 bytes
font_02_sfnt_off00018620.bin
d14ba0d7bbff5e39148bbafd60bdf4195553228cda47b4f5ce72fe840c28b3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18620 18336 bytes