Malicious PDF — malware analysis report

Static analysis result for SHA-256 227f5d100b9a4ca7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 20:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d27d2273b004680be8e7de41c0f40012 SHA-1: eb3ecf7d5dab2a0179860427a2cc899b779d626a SHA-256: 227f5d100b9a4ca7590c2b5d7bae9d615e70fd02704600b8ba70787a72f24f93
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to various external websites, some of which are hosted on disposable domains or compromised WordPress installations. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=task+changer+apk+android+11 PDF link annotation
    • http://sp2wronki.pl/fotki/fotki/file/41101979583.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gepovolo.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/38358821803.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/74261531950.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/26307838851.pdfPDF link annotation
    • https://hygradeinsulators.com/images/uploads/file/76548187344.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudeselog.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/45814696037.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a352d36e6---geguveridavotogisus.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/12513235325.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/bofezimopumim.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/nokigid.pdfIn PDF document text
    • https://olterus.info/contents/files/3494871591.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nureromomujevig.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c8a89522a764e4d43dfe7c9e7b06cc4a/gimudoxifol.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/65957453882.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/23951680922.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l08u7hth8uiqkb6rgnap43vi35/93586665292.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368146833fe---66933997453.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/49295871749.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/37508886385.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa52596a8---sotuvetovifula.pdfIn PDF document text
    • http://htwy.com/upload/file/gotonuwufu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 24268 bytes
SHA-256: aaf519ea155d6b0ee13c6b4f7966e8191d0b0aa552df7eb5eb9256ed6409316f
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 10756 bytes
SHA-256: be889c89e3fb8bca9b7cf14a86b01b95609c9b40812367abd7effe9e3ce8ad23

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