Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c11c7a7decdde0…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 03:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c504c662e1ef6fe214d365f9ca30713 SHA-1: 783dc662f9620cc15d873d1bdc98e4b42e492e7c SHA-256: d2c11c7a7decdde0eb17218fd72e559989d21c3715626ae9b61da71355c8ff75
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crewmak.ru/uplcv?utm_term=the+house+of+the+spirits+summary+chapter+1 PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/4066624816.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/kadedodulinekifalunuk.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb7a242d---80671250826.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/23829405366.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fabf8d7f7b454a112a316ed37e6d6b20/43081678523.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/73556256474.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/nizopemilavufodegej.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xewedenamorerek.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5lebtle3p927j51lqps8fuu1av/14917346855.pdfIn PDF document text
    • https://0900107678.com/upload/file/8101117088.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd032c9d09---68352482530.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/parezusigo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910ba0b1a0---33418439065.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/gavidozajekolar.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/1343592219.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/76fjudl8hfqmusa1d2uqmivde9/99962295545.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/funera.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/09edb4c5e756944704a7eabf2e980936/ximaruvugananu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dfc90f3fe6fce484b9f1935bc4478241/61173366361.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/029892fee1a806ca093257a3dab029d7/ruligejanofelalu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089af5cb688b---xetagepoludaro.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/17656633803.pdfIn PDF document text
    • http://chinahongji.com/d/files/betisakedanefikenizataneg.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/56428891249.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_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 10824 bytes
SHA-256: bf5fa6100cbf2e1d73a5b9c555a3bcb781061096a591567086d7114ba56cc29a
font_01_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 17452 bytes
SHA-256: 1028bba8e0eb6f15cddbe8335df74483df2558b06212a9f0a8986315f69a0540
font_02_sfnt_off00015a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1