Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88c812c38ecccb0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 12:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8b60b97f94e716431424702cbde4562 SHA-1: 275243791f28896638f0c4ad878d3786baaa5917 SHA-256: d88c812c38ecccb046de3b1cc7cfdae3106fbbf0e67241094b549ea65e64a401
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with many embedded URLs pointing to various domains, including compromised WordPress sites and raw IP addresses. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/21882406639.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381c087a6e7---nifetawuguwab.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xawepilisu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/bajalok.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/zazuletetedivodusenagobe.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zemepifegadasaritozu.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/kulizisijabipigoj.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/pivelujasexuju.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c129d53d6---kitatavuju.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/35844835564.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b44992e2---59375939903.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/21193571691.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b28742e---54511535159.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zenosawodezazowusak.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/20172351022.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/75248632689.pdfPDF link annotation
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/memono.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e3c705cdb1795ee0a0997fc450b3410/repemelagubil.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83108859974.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/57417924907.pdfIn PDF document text
    • http://bdn10.cz/files/file/kavatawofufovexi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/18191823637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=offline+android+games+mod+apkPDF 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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10860 bytes
SHA-256: 02eff5745395c58a34a95d26d14989f58f0ce175a79c11ba7069cc21cdc736ba
font_02_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 18132 bytes
SHA-256: 07b44fb687861741c57d257a603399a4fb90fc4fbae1026d2afb88564ee4d791

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