Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedcb11f0d5a6873…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 23:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82b3672948ffe0c12d6e457fe7ce8363 SHA-1: 33a4cbe0df3c010648066ea1bfa229a357d5f4b8 SHA-256: eedcb11f0d5a687397a829751b04fe5d342c3ff51e5ef83c551d3f16d35a239a
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to lure users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da3760e33---jiperivusisutixovosibamo.pdf In PDF document text
    • http://zzzwchem.com/upload/files/karexuxekodojo.pdfIn PDF document text
    • https://majubesar.info/contents/files/78292657156.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/mugarojukomikukekew.pdfIn PDF document text
    • https://themalc.org/files/file/kewepujozupimofatomalosew.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140073e6b340---91931417924.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e4ii1bi6d5maj4190o4g223vnd31h80h/97228261379.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c16071b19045fc91c2cad20597101794/88052496886.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nitenitafon.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/jakupuwiga.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/98067899160.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/65972341155.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/55581354702.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/20365334306.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210911003453.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/7831674539.pdfIn PDF document text
    • http://gibisch.biz/files/files/wisenetobazitewijore.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/80799253562.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/sowujenujubevegero.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/mebojesezibesesojefe.pdfIn PDF document text
    • http://sb-78.ru/files/file/wusadokuz.pdfIn PDF document text
    • http://rafaelokazakov.com/file/peguwokexipisadujoluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=munda+hi+chahida+full+movie+download+720pPDF 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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 17256 bytes
SHA-256: 7510bdeb3590e111cfd5fd9914738037226e8ea0c6c12e8ab9514353c7dcbaad
font_01_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 11056 bytes
SHA-256: 1f8579bd397c96276b08511cc96e57a8af5b54b784816dba868181babc2b4ef5
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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