Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c626e88714bc615…

MALICIOUS

PDF

74.3 KB Created: 2021-11-08 23:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6004a1c0dbb2d05aaabfdb6667e7758e SHA-1: 10489e45f8018a2d726ae47a71b7c9681adcf071 SHA-256: 5c626e88714bc61529b067346606abe014033a6134be22c7be5dbeace3d4336f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or malicious websites, consistent with phishing or malware distribution tactics. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://eclearusa.com/images/file/72728987012.pdf In PDF document text
    • https://ekransamara.ru/files/12614121747.pdfIn PDF document text
    • http://ippon.lv/uploads/File/28719909925.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/25207903772.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109170543158588.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/30514173402.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/sezezubizoguzasisagoxe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/64423793439.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/veguxitepotasemurenije.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/63780758223.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iamam4uarm2ms65458kiboofpv/19125849462.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/19967040278.pdfIn PDF document text
    • http://liyangah.com/Upload/file/8033734840.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/lisixigimivunugoras.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7f98c3c9c---sozelamekedoterex.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1700054988613cf33d2740c.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/85982736611.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/31208742760.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615228019d02c---wenataderaligelo.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/wewipuxalujawejisag.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/dobamawufowugefadewajop.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fikiw.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fuxipanaxepibinatoja.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/meguzalitomezibib.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d6dbf78385a3b6293789bae926c25d66/91740544612.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16176710ec5281---99550390758.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=the+god+code+pdf+free+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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 10592 bytes
SHA-256: 13a858db7783c9e35957d8e1d446130acfbf8dab05ce0b15d65b525d63e19304
font_01_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 16388 bytes
SHA-256: 6c9d4c2e35e84809764706ccc1235c750b4d420161aa55904515c021f0477f89

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