Malicious PDF — malware analysis report

Static analysis result for SHA-256 b463ec8ed7e5ed50…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c71c45a9a04daa2f61f2c4552e4a080d SHA-1: b4bbfc80abd2d36596b21f0023ef1f3a2eb8dad7 SHA-256: b463ec8ed7e5ed50199530a4b1685dd265950ea6f34b2f44831241415d87ce59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient evidence of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=icd+9+code+for+numbness
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000fdb814---gawidajaxejuwixivule.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cfaa8cfc6c62a0397cb21b473f726c10/poxapeboxuraritapagifidiv.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c1321373e436356346fb9fd298006ade/wuverirafidowi.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5ae05d20a---bubolifapinagevuzivas.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f23a138e---4259175338.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/240ifk32cq3dl27r9qhdkfg483/96214453052.pdf
    • http://astro2sphere.com/admin/images/file/10438243128.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fl6i83biprf5qura022u4t0mo6/89367397159.pdf
    • http://mextro.de/upload/files/zumitore.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef35df61---bokodofapetojup.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/25659433939.pdf
    • https://lacecinella.com/writable/public/userfiles/file/15673268597.pdf
    • http://bright-mineral.com/uploadfile/file/2021060218551414.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c496f68f5f6cb6fa0940d80dbd1fcbed/wigonotes.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cedbf27ce2---mebami.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086813e25c7e---dexafosop.pdf
    • http://naviway.su/upload/files/zupujufigoxezumatoxedajep.pdf
    • http://pileshoppen.dk/userfiles/file/lemivefamowudufibafu.pdf
    • https://kawanmto.net/contents//files/nekupawunaw.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c2e83511---sorulu.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/p7qp47d3i1rfaja3v57pcg1154/44002901181.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tavi78vk3hlpq0n864if3l8uj7/fowimozamig.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7deb4293---33009104630.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0bafa7a24303eea2ff04229e90dc3045/nutoxijin.pdf
    • http://reicar.dk/userfiles/file/29664736961.pdf
    • http://taiwanglassgroup.cn/userfiles/file/nuzavokediramigejakeb.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_off0000e595.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 16792 bytes
font_01_sfnt_off0000fdac.bin
a65f3f66c3ddb24a099c60cd9be6362eef25db1369e1ddf25c688160c44f0f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10596 bytes
font_02_sfnt_off000115e3.bin
8e5b1cea2617c498f9e1e5913afe4e104f9dba355fcdf619152431104d95b749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 16168 bytes

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