Malicious PDF — malware analysis report

Static analysis result for SHA-256 52277ad36ea85a7f…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 00:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf8fecc964d890576c73d872641050bf SHA-1: f5d20010e17b418c2e4e0448fbf66ed7a6eab96b SHA-256: 52277ad36ea85a7fab19085ad274d86ba4fb71832d8c8a70275ffe4d02c1057d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/91cg5okmjmgqb7dt9417hutd77/2579583627.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d435f3eb85c---japosagoxisuxive.pdf
    • https://pima-alarms.rs/slicice/file/tuzezofesavapavaru.pdf
    • http://czdashan.cn/uploadfile/file/2021042822340273499.pdf
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ef5ba20f80c50edf695e30b99889be8/4044663594.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857e8e8f08e---8095715223.pdf
    • https://grandhotelbulgaria.com/userfiles/file/badezavibadawunire.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c7d345b9---masaz.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/426e96783ee3514a983189318b9e303f/80408667882.pdf
    • https://alshaabcoop.com/userfiles/file/61521755694.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c30ba59d4---xirotenanaduma.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefe786907---6709559529.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6677dd3c0eb69426311824020429dfbd/garosejobodunuxi.pdf
    • https://kiameds.com/images/upload/files/wujarurubujegej.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a440f09454293ded836aa65d1a4d0c74/71439440019.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0d34531---83441327668.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5311da83b---50012678567.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08a584ba2---lifidebi.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65ede12eb4a20ee0ba87bd3757bb08d5/xizame.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8koidr6lrbe8trcb73nquuu71s/26987217020.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/57204f51ed0e6677ac539b5d86e51c1b/62290326845.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca9bda35b---likajemagurobitawuv.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6b53a9fd879bbd470c6bba6bfade6720/tirup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=funny+reverse+poems
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8747d400---4390575993.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_off0001104f.bin
a832771fdcca1a32006a33b974d231e6eae0b1e810daa35adc58dfd1a4917cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10272 bytes
font_01_sfnt_off0001276b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
font_02_sfnt_off00013f7d.bin
4d793212fe798ab3745bb4c2be306d06204c3d7b02e9311a509e41bdc031747d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 17152 bytes