Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a40110fdc049c24…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 14:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a67f7b5ac7522beb53ab2792feebd66 SHA-1: 8ee0343fb1df2c283c6427705f0d6d8138852004 SHA-256: 4a40110fdc049c24c6b6a94556c81835db3de45f059fdb88cf5ad6380d490cb6
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 websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic supports the classification as a malicious document.

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 http://jshtextile.com/UserFiles/file///lidatibuvig.pdf In PDF document text
    • https://atamergranit.com/userfiles/file/85229913003.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/31152741724.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/030953337569.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662dd9628d---72790557151.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/21080036005.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lj1l4tach55ncp5ae8ogg7q3e2/73033674480.pdfIn PDF document text
    • https://wasael.com/userfiles/file/72543361686.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/29545140824.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e88ee60f---60666586878.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/24056408321.pdfIn PDF document text
    • https://clove7.com/userfiles/file/xipipufigolarilo.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuwigajutatukubolosa.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/88716089616.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea45084690---29962938910.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/37481380934.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/rasameziv.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/82058100913.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/51985665527.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vojaxuvukizobita.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/96481227521.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/13188563502.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/78000500812.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/96805060147.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/10400667632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+fire+aimbot+app+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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 18316 bytes
SHA-256: e77ec0ceb866bb68a9a36fbb14d2841a9047bdab76d0b222329a6bf6bb9a0b8d
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10692 bytes
SHA-256: 195fe928ccea776ae945a809fd022089df4fd16679bef477c6c9c14a398b5c46
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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