Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882481182507085…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 01:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7d5eb3d3db38889ade57ec9824f29c8 SHA-1: 1aedf884e4143f411f0de679012c928f7c70ba4b SHA-256: c882481182507085c20adc0f8945106dc530c79f2f1175839ad3b07d7ed6a108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic suggests an attempt to leverage these links for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a malicious intent to redirect users to potentially harmful sites.

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 https://crewmak.ru/uplcv?utm_term=renpy+adult+game PDF link annotation
    • http://esrafisek.com/images_upload/files/fedavajebutomalamidetumej.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/siwitarupitiwetosit.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/31367518154.pdfIn PDF document text
    • http://edituj.cz/res/file/76075984168.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/zadatolekapan.pdfIn PDF document text
    • http://capri.lt/userfiles/files/tajeleterovajile.pdfIn PDF document text
    • http://sartor.ru/upload/files/75196343179.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/506b4a1aa51855445aac8206207ca0ce/peburebuguruze.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/67724632716.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wenakizamutujomulamus.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/43329895210.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/vedazobejofa.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/jiguveguzuvepopevejuzadab.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161395f5b75852---14319977668.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/62299454176.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tl5n9s83suhe4g1tnrfg17gc3s/zudiwuzar.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/wojewubanaramifigexisali.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/67626218585.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/14037985528.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/wajasumesu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c332a7059068e82ddf7d2013887d239d/pelugulokesuxezogi.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109151233117065.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/42104857799.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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 10516 bytes
SHA-256: ad547f08fc0fc5b220c406054bd81881d98e3b79bd7b3719e8446918bca769e1
font_02_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 17588 bytes
SHA-256: 35f898008c251370702db7598257b49c09c46a462a3ee5f209dd9d033dbaeeb8

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