Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d789c6fdbf45358…

MALICIOUS

PDF

74.1 KB Created: 2021-10-04 09:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 97279e660aed3c9e9801da581e83e53e SHA-1: bda99f021c89e1bfcde9f43dd537c18850b626e4 SHA-256: 5d789c6fdbf453589bda1201288eef46fec6d91b372ada6511acb5953231ba73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, with one link specifically targeting a PDF file. The ML classifier also strongly suggests maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://custom-mugs-factory.com/uploadfile/files/7855972253.pdf In PDF document text
    • http://envigest.cz/upload/file/jelutifibuwapage.pdfIn PDF document text
    • https://novitas.ro/files/zoxofuralovenopogikes.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/46048519599.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/mibirefotusurilawaberel.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/13555590343.pdfIn PDF document text
    • https://icbacademy.com/upload/files/pojizagab.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/53030899339.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/22647552866.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/24515539253.pdfIn PDF document text
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/71780420869.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/notoxamisokez.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/wolawotogezodepuwavow.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdd37f2a8---49480133918.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/remigemiligakoza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3de5a41af---55768789910.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/busenatonavudiwor.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/93668638221.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/16624951788.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/98183242255.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/zadubadom.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615971cfd2612---nidapaxonulesu.pdfIn PDF document text
    • http://langyupharm.com/upload/files/45020324404.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/17524006798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=introduction+to+biology+textbook+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_off0000b87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 10964 bytes
SHA-256: 0142b0fee83b4f8b1cd7ad77edec8137e95ad3697d1174fd192399d8476207f3
font_02_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 18956 bytes
SHA-256: 2afd71a785a336bdb426e406ad39ac5ba5a632725174c58d43097e3f31babe16

Open this report in the interactive analyzer, or submit your own file for analysis.