Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fc80cbc32867d1…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 02:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 58cdb382ebf32bdf1f74f51563c06bbf SHA-1: f554be2a819a0751e0a3e9fffaa71269c422317e SHA-256: 45fc80cbc32867d1598e9c4890a0237abc73273631e5cd318617256ad35dcfa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 compromised WordPress sites and disposable domains, likely intended to lure users to malicious content or downloads. The presence of multiple compromised CMS upload links and SEO-focused link farm characteristics further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eternaseguros.net/files/files/57308308101.pdf In PDF document text
    • http://krakowska98.com/zdjecia/fck/file/zosuzipikutuvire.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/50866a68583a4cc49ceddd9b31017a08/soranozag.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pulapokawixuwutagojorobek.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zikazud.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30171956394.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/50531377335.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/98260810437.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/62875977847.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/16485932586.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210910194851.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c12c85462---kulabotetigut.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xeded.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/nawupininezam.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/livapokad.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/52108987726.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903131012.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/7578551087.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/25564392510.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d1b5e2a648ff555dca4be9af8f426c69/vezunudarilefetajuluja.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fusejujazitavizivagejox.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/silojosepozuduto.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614148d27a736---1934083349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=screen+mirroring+apk+para+tvPDF 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 10736 bytes
SHA-256: 16bf6bc88b50e22999603e0226e6e93a9ed98a6752a7bda02e716151d90d6bc5
font_01_sfnt_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 14916 bytes
SHA-256: d0c4f46fce80b74f214aa8e8ffd4e33edfb3de310d3b4fd87c755e3a6baabfe1
font_02_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1