Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7bc4bc699ab802…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 21:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c603fa6522bc4e8e6147c65f9263a863 SHA-1: f27a9c72b38dca354e531dc65ec44956f750fe69 SHA-256: db7bc4bc699ab8024c081fb5512cdac2b1a72585b02f69ad843df99c7315ba79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs hosted on potentially compromised infrastructure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28a7db4ec---57566079754.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f369f967d6---31861269977.pdfIn PDF document text
    • http://stonebreaker.at/20084834768.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/74921051156.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25190455259.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/75fsq26kd35u7ce9hmufgjqtd7/zamesuzanodabufumax.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/50757013792.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c112ba310677e3813f3cdb80c8be3e44/45922331986.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd07e530f---97675808458.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/guzajupevoxudoliparo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8acbc27468---bowozuguxesozetutul.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pk4k05e8qtsir33q66eqovg5u5/89347220415.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/fudejofezune.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3eedf716053cc511980b23ba2d5f5e41/wugujaxovopaferalowuwunav.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2fa25acdf160574db8ce4101cbcf1c39/58528869887.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/49b56733a6fdad885cc25e8fe494dd2e/94656985933.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e8671273---surejibulivulomodi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xipije.pdfIn PDF document text
    • http://gptools.net/userfiles/file/59558313049.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55940091269.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/99495211726.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af97fa98d92---wunosekowibivogut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413b4f2d63---renumapisuva.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/lomow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chapter+14+the+behavior+of+gasesPDF 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_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10856 bytes
SHA-256: 32afdcf948f757043bb075cd72b7205128329a2baaca7191fe61fa068b70aaec
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16788 bytes
SHA-256: 0f48e1dc4bc4f3c23beba489d4e08c43ac5371af2611d3f3e411bf30689ecbb0
font_02_sfnt_off00014325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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