Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cdbe9d7a2ce031…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e467c9c8e4f005f7d6ae8dfb03202ae0 SHA-1: a5607841b309336d9434430c772e7823be6bf8e7 SHA-256: e4cdbe9d7a2ce031ab047acd41ce6e0293ab94a40010d1c3b26c02494db89218
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://medsplus.us/admin/images/file/fifuvolafe.pdf In PDF document text
    • http://myucpb.net/userfiles/file/20515180860.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/61137478296.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/00fe6eb3fd49d639d30f1c509838e9b3/78356189565.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d16af9074dda4c70400bc6d2fc95d552/49744643332.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/39559068448.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/7376685275.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/40371423043.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd35266a93---48370608714.pdfPDF link annotation
    • http://www.siscbolivia.com/admin/uploaded/fck/file/68193280081.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1f322d2f2110012fe076901bf18334e8/pubagemiz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/05ebd0a1a23fc5e843fbf978f6142d7b/witugosimopivigad.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/dujimepijabixexujazogi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zorubafumosafajatit.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/24201131909.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8fd5efba82925db14833ca9a97f5a58b/vebitulimelazawuw.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/33656190806.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/83cbbfb7f87bd612e9bdd8f54fb0172d/fajisovubujaguba.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613712c206a92---88678696103.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbf10d108c3ff99bf2fe9b611045e875/12959472131.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kifokixulimawe.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905002736.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/37995264813.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/94561676986.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/39518255810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plex+server+on+androidPDF 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_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 10312 bytes
SHA-256: 767641d2e577ee0e27e8f4b1037bf7ccb1b116ddc98d5ec44ab06416375a3316
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 17568 bytes
SHA-256: 7d70c47c2474e35816dc6490cd58863e59221badc83f9f82270e0e717ec66c75
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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