Malicious PDF — malware analysis report

Static analysis result for SHA-256 af647f0b8050d91c…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 07:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fce8656d337fdae50cc080c9ff71560 SHA-1: 9e513680cf6d19a1857b1baf382dc50c5d3d4520 SHA-256: af647f0b8050d91cd42f269ea3fdc3372c5d9d007e4b7edb9d329c4db0340e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a7fdd3ab---31839088461.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab998c3da6c---wabekaf.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3379fce4903cfe48fa701c37e42b48c/66820812387.pdfIn PDF document text
    • https://ekransamara.ru/files/sakudekelodinagotazope.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fufabe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/75215487718.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1facec1dbf---zurot.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3b88a4f7---fabovubedefexu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/18152767314.pdfIn PDF document text
    • http://adveotec.com/img/file/dakajigazenenagozot.pdfIn PDF document text
    • https://corghialberti.it/file/79095732381.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/79dfa093270e81e1cca4caa076ad4d9d/jizijo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd764dc6c5---89676006758.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071380dbb389---dudotaxowon.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a812acf40b---tupixoledaberufadi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb3c93055---zerazaxasonijologovip.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/8865379162.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/rawikedeg.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/683ad6950774133a288daec900f01cec/91743850485.pdfIn PDF document text
    • http://prmakeup.com/Image/files/37194823719.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/65332809889.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608713c34d84b---98768096419.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/84626fd765878014e88f5114bd439d9f/kajunomoxoj.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c5dbac0b396532439da391bdc244571c/pofoja.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0fd39ff6114a339de594f8a705d39125/88381376148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stitch+coloring+pages+for+adultsPDF 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_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 17548 bytes
SHA-256: 1b81f2fe32ac9099d3d6218e58f603bc68c8540ff971d749d86b0fc649ccf5bb
font_01_sfnt_off00012e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9B 11072 bytes
SHA-256: f69d9bb8c845743a2dac425d95c739604c4280b1a4a54bac1dd185e4bad4aa7e
font_02_sfnt_off00014823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1