Malicious PDF — malware analysis report

Static analysis result for SHA-256 af164c99c436c7d1…

MALICIOUS

PDF

87.3 KB Created: 2021-08-08 14:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b93ba6ee176671789ca863bbfc9f8a3 SHA-1: d6bd2ba7b84f8396dda5729f7d7d06b296d190ad SHA-256: af164c99c436c7d1d6484e1aa74bf63738160061060403efbdb8132d5ae4128a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/731c0971a598fbf4aa5b4f19eec869de/84642740473.pdf In PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/gupugisizu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/xarawisadurokejutabi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc743bb8baa---juvij.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/o5u4iffos1jf8q816dv09hdcvh/48318461656.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kixuzerenepoxide.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7915fac1eb---nunawag.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/35401516216.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/kiviramapipekabemaza.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/97884648745.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/53701696271.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d779e3aa913---zanuguxigoxibusizasew.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8594b8f9408dcc1a26d55367a634c318/ketazore.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30322674895.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/34221858495.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6542be0712cf5656c936e45798db5698/5269567374.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pmo4jtv2iukqvpnfk5nint12q7/37678640627.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mepemigek.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/modoturudobixanag.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c7dba82183c94fd4fdc5142c3970aba0/95999155858.pdfIn PDF document text
    • https://blugarden.eu/file/wiraxinawuwuga.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16099fb08b3e08---5688791435.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a348b035ffd---67774574913.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/26149694835.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a38e0a7---wezurarefapubopofuvoxogow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+saber+las+contrase%C3%B1as+wifi+guardadas+en+androidPDF 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 18072 bytes
SHA-256: 471582538a4be1a0eea5d888954456003e9bcadca9e1e854f7203a54ad395511
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 11380 bytes
SHA-256: b9c9b39a74cf6611c2326bfb6b8a943e7c2c86376ee2bd8c03b87045e251ec23