Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c1d6f39a397274…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78fb928df71fad355d1490335e9cab48 SHA-1: b14fa4395d765f259f9b77016bcd5a9b8fa97ea4 SHA-256: c8c1d6f39a397274f32ac3e7e4ec00dcc8bc0411d2e39d6d0cfd53713d9aa240
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its function as a malicious redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/45efbefe6388a632717731ad69f1b7fe/34863485056.pdf In PDF document text
    • http://laduses.nl/image/file/22479294786.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/da123a281c1d54bc32069ac8a60edf73/bunubevafik.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/82ebcf60f54ddb17553a97f34d3357b6/parewukezomekapitubagebed.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30bd6dae9---29638510765.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/6266349781.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/bijudimarajekedutawi.pdfIn PDF document text
    • https://ckmandarin.com/uploads/ranomofepalozisaf.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/50529657451.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/jomikunij.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6c1592a0---nijubiku.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/42397235128.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a98a9592---wuxifineva.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/310264fa2dbc767e2e06e632aa81901c/xapetemagezijavemoburepor.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/wupurorifisivazuxibo.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/42544205351.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lok3rugfahhchr7fe9ikadmjil/62866819227.pdfIn PDF document text
    • https://turbooto.vn/upload/files/vasofolenolibopefemupa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zuditibakovozasajawaf.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5414ce685---wogoxifikabibemekadu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/fomuleridor.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/70291590543.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/8823952718.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081072396955---patugotefobiv.pdfIn PDF document text
    • https://plasy.com/uploads/file/basep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kass+breath+of+the+wild+songPDF link annotation
    • 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16536 bytes
SHA-256: d4d49df9c2bc1520c54e3b180bb045294c3a32afce400a5f5e2ce690222bfb3c
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10852 bytes
SHA-256: ee3c88baa7c020a6e8cdbbf0f1551dbee09e3aed83024dbdbc23cf6b57a93127
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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