Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59141061f707d36…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 11:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9cadafd582efe1a3d7d9d3a31697db4 SHA-1: 814644de0a64e737670d9c412f8cfca5de3683e7 SHA-256: a59141061f707d36dc8e145e38ecad0b29c9d81ee0c7857db83e010d6eee54e7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cbcf876808f6577f12f9b587589cfe20/76002633887.pdf In PDF document text
    • http://dentistturkey.com/image/files/94690429747.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/3906848074.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/44247379474.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/gavewuniwulado.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/jivasifavafavapizet.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/84438920106.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/88787272231.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/kubagofesisukejujoxof.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091019112188.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/baxukibexan.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/eb982sems553jm4bbnvo621q28/93257960455.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/3290313001.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/zukodaxanokinuxekot.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/limemosironuvekoguderut.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6bc86c7d26274d7c21fae496b3f2ab3b/12671455067.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/69592955002.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51916395035.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xoxokipiwowimax.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/46564070750.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/96904355612.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kesabokosavibig.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161466c4b053a4---kenodinowew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hack+facebook+apk+downloadPDF 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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 20072 bytes
SHA-256: 0a551ec1794a7e0cf514222cd4847919e90d1e9f6508f1fd4aef8ef0f80725bc
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10464 bytes
SHA-256: beb8b7758915fcff3a496de03bd460b7823e1cbf7de61020bfa4f880c9f32371
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1