Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae7f8037f8044f8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 23:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5c8417d88ff15752b0eff480fb8e6ca SHA-1: 8a0f35c4a1bf79ae6af4cddc212a2ae7c0212363 SHA-256: eae7f8037f8044f8cb6a641cb72263f3bc90661b703653a408d442138308bce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=locket+app+download+for+android PDF link annotation
    • http://lnv-cnc.com/userfiles/file/62643440181.pdfIn PDF document text
    • http://davcpundri.com/css/file/sujuvuxozever.pdfIn PDF document text
    • https://hobbypet.cz/files/file/junakekobajovewozafibibed.pdfIn PDF document text
    • http://vuason.vn/upload/files/viras.pdfIn PDF document text
    • https://primer-spb.ru/files/files/57735226103.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rametabirewisuj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a7bc73c---51203979262.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139391467aaa---86436868840.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/81759059261.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12dc0a69---9832139492.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/68228702743.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/jetonup.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/nuxavasidodovolugat.pdfIn PDF document text
    • http://groupkaishan.com/d/files/bapan.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/21401791155.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bajoru.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/64938825484.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/ziwodozogomofubaso.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/wilavobokuboxapo.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/44043989643.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133358777457---zuwimuposoninokojaji.pdfIn PDF document text
    • http://chinalabware.es/d/files/bokenapoxesimipevuzoxilal.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f658d4a99---88081856796.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/tujoxolufirosatesaweneki.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gexoj.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_off0000bc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC03 16896 bytes
SHA-256: 47556c2e0c99cf1ecd2c5181b0d7a70c03cdc5c008a806ca307c3fa7afd5a3cf
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10580 bytes
SHA-256: 137db256edc0c3f0ca8da10aeb13e7af8ee6e3781657551b34dc00df14a18b13

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