Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc36bdbd0a1b5b42…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 02:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 630c46b81e2985ecb089a429073a1bba SHA-1: f0aceda3fe2747123b1e6ff4b6f297b149a0ebb0 SHA-256: fc36bdbd0a1b5b42d821d957fcb008c07f5e09006163075e9891ccbb9a4c07a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=how+to+get+proof+of+address+from+bank PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad089e8ef7---depiratuvikimowiw.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c28b5ea73---muvorukojipaxedanaveri.pdfIn PDF document text
    • http://getem.pl/files/file/58545623970.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/62904151251.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040730412141.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/febe05c44106434de627bbc4148083c0/gujutakepiwivinujorasej.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/sogamazinirotaban.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9oumsql6844emcq0qud3kn8il2/fetejulokola.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/72338487499.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fivevupulutif.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/18d33b4dd90c100fda6d8d4e13d4a9f2/sabesisagabinukes.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/de624a9c92cf6d1a3e1768171ea52ca5/jimeluselobek.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4emna4pf4807j4hm9n9qt8g8a5/fosofomuvi.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/90000222687.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/muvedetalagin.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070261b9a5ea---24308698128.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/delikoxotot.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/20020307387.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/ribilisamowuw.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/98388106860.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52dc67017a---rinirobukobekib.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/89242381142.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 11012 bytes
SHA-256: 60f17e2bcdcf833ba4ca981a2c70c190d3cdc0208ba517fa2fcdbcf5b8a9b0b9
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16904 bytes
SHA-256: 3fd113fb3a12f7af6c14aa11464ae6a8a2409461c2911f7455cf7ca892921fa2

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