Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95334f5c91008db…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 18:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35445cd12abf2a1de9e0c18faa464a25 SHA-1: 393ebab1cb8c546c5f0f5e8ddf87fdda9803e3f4 SHA-256: e95334f5c91008db97345ff48758b37e539182dc8f6ff70d1400432ae9366639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised WordPress upload directories, suggesting it is designed to redirect users to potentially harmful external sites. While no scripts were directly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbfb93789fcdc9c247702dfd6dd2dde9/30444355443.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d293dd15e1---35610922854.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/37980993949.pdf
    • https://hanahana.vn/media/ftp/file/lufafuxoli.pdf
    • http://studiodabo.eu/userfiles/files/6899205949.pdf
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/80949702802.pdf
    • http://reutlinger.pl/userfiles/file/66795809644.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/votisorupodoridewija.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eacf12abe6---xojurirojikowini.pdf
    • http://russia-ex.com/tevexota.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3o79sda60se6egdg0s4s5oktqi/samanolakepesawemejezena.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee477edb8---34553543081.pdf
    • http://www.toeterloeh44.de/files/19258916457.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdai646909jh7isibl22t9v32j/tevajimumuwiw.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/tct9mchtn4c2k1s3hockb2vc1b/vusopa.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/l34gg93l491dn4iqqljruosop7/xosukadelokar.pdf
    • http://stalmost.pl/userfiles/file/ranefuvinet.pdf
    • http://teifsepahan.com/files/file/norire.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ji5cqo91ba50f59jcgeggqkdt2/94563189271.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d87ba1003---daritid.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f347a1ed2e---zazokosefaranetimir.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9428be71e1---zajozafotexujetoxaf.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0r83g362h2muoal1hmh684bfic/dupakeduredipero.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715f6119f3e---ximipejekemekakegebafo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=class+7+maths+linear+equations+questions
    • 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_off0000ef1e.bin
cf33ed4d4e34ad277548cc6b32edac9fbf28cba95f54a349d17a824b7048e0af
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10700 bytes
font_01_sfnt_off00010782.bin
76278a8653b04651dd19f45816a57009e7a35944c75816e108ea46f2b53edf0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 17256 bytes
font_02_sfnt_off00013502.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 16792 bytes