Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca45bb8ec0a1d02…

MALICIOUS

PDF

73.2 KB Created: 2021-07-03 03:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d53645854f1d5890d9c199fc70179c31 SHA-1: 2e0bd2493ee5cb5c3964e50cf930cc919fe43a02 SHA-256: 6ca45bb8ec0a1d020128c61af1cc73178138e81f41b555526fc3ea92392cf86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://lesfeesdelhetre.fr/upload/files/biwugirepimuzelufifogumim.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cf50a6ae---juwinax.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b2c692abff25bd1951fa195f0bd5a21/28063152283.pdfIn PDF document text
    • https://davaocarrental.com/images/file/82043505506.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efe758098---99978532942.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/53734511677.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8359161f---30959911871.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/64142248252.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xabebog.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210614000507.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c17f63d66b74d148c08eb2380da4cd77/mepofitonufegador.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f1bbd192---xenovi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/9372268717.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66581f1804---vodaxedevilix.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5b9696d2---55703795208.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f91ebe758---67155636669.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b282ccdf1aa729e5a8747c5656e45ff8/riloxapujugiput.pdfIn PDF document text
    • https://bauarch.bg/files/72666261224.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/pakilidupisolalido.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/21838078732.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fatewozubosut.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160941e66f1e11---3542668249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+mentalist+watch+free+full+episodesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3ea340862efdc36f991ab364fd689bb5/susidogemewivo.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_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 11036 bytes
SHA-256: 9087fb725990f732647a4e07f5f344fd1b4ba5c37acc256967806c2ee3f7d9f3
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 16144 bytes
SHA-256: b425ec48249e5e076aaf42e483da6d4398a1d3f4bfde0109cce3bd130047b90c
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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