Malicious PDF — malware analysis report

Static analysis result for SHA-256 de79e57aeba3d9eb…

MALICIOUS

PDF

75.4 KB Created: 2021-07-02 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4979b4938536c19993a4e2047a272d82 SHA-1: 2ac54203ba2e2337491492d5fe11f375a7005cae SHA-256: de79e57aeba3d9ebfefee6a27bf4c5528f23dc13c35a297a30980f650fe1bc75
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress uploads and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=meaning+of+consignee+in+tagalog PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef5cd14d11---23018688206.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/foluvepema.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4dlio90rpck3am37oja277u5sa/zapezitasezerexibalenoju.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/linobixopifesavaluxuv.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/45b6ca39ba3f5452e124974b71bc8b69/27258474489.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32caf58781---komadutodufuzorufaduvonuw.pdfIn PDF document text
    • https://kawanmto.org/contents//files/47045982202.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rub895lqbc1blmdlpgn7dj33fe/telinojuxasutedidotelere.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc009b0871---95701017496.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/95909690572.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xonexepanejebi.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/zagifexigiruvewuralowox.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pbl279nvf57i5sppcmf59cttgr/97276197961.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a38e0ce7ec484e2ce28e896a2ed3685c/sisavokilukuv.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/25a188021cbf3f0779032f19d8ea9ddd/nekizomap.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/30631925566.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/14640200319.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1mcihcc8j1urdqess7vmjlujj0/67125285994.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ul3le728fc0m9noo6vq3off3p/zekafetopudowojadarem.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nipufefibepudugabivob.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/todexekotunobizoxatafu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tusudupoxedaregobotozu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 17744 bytes
SHA-256: 67a7d1b053e4920c39db0288682294d1986bde75f3406d115e4bdedf176b1366
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 10404 bytes
SHA-256: e3f9c449f085f47162ef2e887200ff836d5ce69f5452bc78233f7135424ba46a
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1