Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7347c072b77c0e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 00:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2742e08b3079499359a615d4603bc578 SHA-1: d4cf283d16692dc356bff82c083b226e9ea0d618 SHA-256: 2a7347c072b77c0e61854404333cb4246a4c779beb2ded4ff1eb61adf18a543f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dream-mebel.com/pic/file/9783650698.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867d88a726a---11234968404.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/36969263604.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/59936610290.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/73158375206.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/41188054036.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/71288195842.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/13729956112.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/movutuv.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/71628234874.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/499b898e424ae059bb47cd1f28aa1994/kunubufovofugawukapipana.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/panujululit.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/41276917626.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5b9dc2d878a12bce7107b81bd6fba4c5/91414282460.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2288eed94---bawefirosowalumisu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/88495881389.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xuxizorudaliwipu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1db327aee---31774934038.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/58413029861.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/raguxajakugagufuzejefuz.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/48381750790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=zakat+rules+in+islam+pdfPDF 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_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 21252 bytes
SHA-256: dd37fe3e84833db4231c9f36c6c4bf43013db4b0cb72f161116654d4d2ccbdbc
font_01_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 10692 bytes
SHA-256: ab4b2e6101ae454c3f6195d496f8b5a1807f7b4297c6771038bdac0bb8cba35f
font_02_sfnt_off000141f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1