Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc55bbe0a11337a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 02:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e03325488416f3df6e0a5d7ce28e4a7 SHA-1: 56ac540abe8d0bd5ded4d80d0a4a157f04d2c016 SHA-256: adc55bbe0a11337a54b4526bd7b685d487d32d34d87fcfbc2aaa60702cf07479
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, acting as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=cfa+level+1+book+3+financial+reporting+and+analysis+pdf PDF link annotation
    • https://parlagame.com/calisma2/files/uploads/rawilefujikid.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dhkmiqilioq80kggkinocars9g/25995900441.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/85321114096.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/67936389092.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/72522043316.pdfIn PDF document text
    • https://2acontractor.it/images/file/26347797687.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3897d8937a56f4f1531d1044bfe83586/55021993452.pdfIn PDF document text
    • http://vpsystem.com/files/fck/pekogefixawafomar.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xerarurodanovatim.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d9737bf6---73038965350.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107070321083683.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/bizekokifazis.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/nikeborotawatorivadiwalub.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fibanunozegijejagagezonu.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vuxupexiginub.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6f5a1d49dca70834753e64e384929e7/376101642.pdfIn PDF document text
    • https://kildevangen.dk/files/kimazavugetowoj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc542cafc---tisojujoxavosebovivopo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/favixidepupodebus.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zemenorovuzajirimumikora.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/gusujaxisipimozebe.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/3472686611.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d880bf828---26931775425.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 11460 bytes
SHA-256: 064b09a0bed270ea15a0aa29b5b433a496bd989eea076f0b7c5ecd9083d313fc
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 18032 bytes
SHA-256: 742831d11da34ca75f2e15a0926b41acbd539ebfcb3cd97d9bdeafea5c2424a1

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