Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a32bac495b72d6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 23:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba3cbed080ef19b8a3250a143d74ec37 SHA-1: a0565815901fc5ac72ba9b78ee8173917d94ba9b SHA-256: d3a32bac495b72d65ba41214b05496a19fd78a8e4696270e2402edadd8f6ba24
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to external websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=how+to+make+brown+with+purple PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3eeaa37da3d356501680fc70d92f725/49165177052.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddc828aa---33188213623.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/sevulewizamifowevebaput.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/79017257037.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/61042037154.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/40132076134.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/50917354653.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/polapazaminirepifixususo.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/89340136339.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/79096635705.pdfIn PDF document text
    • http://c-six.it/userfiles/files/18347921496.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/27146135502.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexawidokamasexiboga.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/kufewajuvaniji.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/1745653650.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/92363483076.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/41498866067.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb2e3555---93329395177.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/a6124a84d2faad157d19dfa4ffd372e9.pdfIn PDF document text
    • http://yibetter.com/data/files/14749649598.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/19266991641.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/sidutubasosajedubefozi.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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16960 bytes
SHA-256: d2950ad42eb9a434ea458617f5078357f3d38cc0320956ba469bba81745d3434
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 10760 bytes
SHA-256: c91ca24f9639b13f3bc4e71a0ef46b60b9111fda9c6d9f430cbdefd1439584a4

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