Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c82d30f47d1aa9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a8f1787a76c46d7d075bb4da6364f3b SHA-1: d4a2c279d16951d1e0c41c00b202ff3f6db08ef3 SHA-256: a4c82d30f47d1aa92a7ef8253862ca190ede38618b42ef33d8b53a28c788a300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=why+does+my+honeywell+thermostat+keep+flashing+cool+on PDF link annotation
    • http://decaiyun.com/upload/file/210714024252551878j3cvhrwp3v1z.pdfIn PDF document text
    • http://palami.by/images/file/tesurikaxokelamil.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/60352579870.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/78e88b6f1324db1f90ed8f5f4bdecfd9/47281374424.pdfIn PDF document text
    • https://webmenuplus.com/images/file/10625887580.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6fe3ee11---pifelofemovopewisofozo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/26d5d52c16c5942324e1720079c951c4/52479156064.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/871948fba3421606cc79632c483119a7/51401031692.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e86063298bd13b23f69818cb64184cef/lizekulededesepagutobef.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/11236984852.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/53933641136.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/87864f9659d49533dc60240b091a394b/vureberox.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/runupibiwipaxufopisudo.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/28158850660.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/525a08c796763efb4b9ea43f43d2a1a1/nakadabiworofapasoradal.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073879919b4c---rejububokuwukife.pdfIn PDF document text
    • http://fullx.net/files/88563831931.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/t2c9bptp75mrl259l4l6qt0iv6/figozi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/61868430231.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8b0n5cv5u2plmeasge0qs1n7h4/riwobage.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e0a17a9a---20934906416.pdfIn PDF document text
    • http://allycatering.com/userfiles/tuxivoje.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/6778318339.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48aff6760a---pakukezunogijifad.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab07f6cae4---mejisojimakaza.pdfIn PDF document text
    • 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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17192 bytes
SHA-256: b11ab7d514d98aea01e10d9e12939330b38c3873fbed3dfc7141c72848b3e6cd
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 11352 bytes
SHA-256: 2ade044f6a4e1c2315086f36d6c62a4aa74c8e250da6a17057c51a1b682c6919
font_02_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1