Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d33bb8dddf5403c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 17:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3e580f4464c9c661e030a8e5abf215c SHA-1: 156e896cfda821ddd7e8fca99faff84cecd4b598 SHA-256: 2d33bb8dddf5403c0aa15691acfbf79b391c3346b339e8ca3dd66c8a41802bab
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of a 'postal identity card application form' in the URL parameters indicates a social engineering lure to trick users into visiting these potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e988e6f53d---sutiluzenosagopujiber.pdf In PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/uq6qsvqscrtv2i6rsm0pcmgiq4/2114348593.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51576592839.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/24922739297.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/71343502582.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0c4898e76773466ded7968aee8c72c80/89282775695.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612999f16a69f---mumipamovekoga.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110655c07aef---budezukaxumebiwa.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/93s0mf4fh39oga8mn09oattu7t/nipisajobus.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/bekudivodoveridukuv.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jugurinutin.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/zowosoxuwugebolisu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/57655045949.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kp2ormd8hck13cvkvcrjmf7r58/toxepenovab.pdfIn PDF document text
    • http://htcable.cn/d/files/sofisibamuxefiveguvoxol.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/84520343365.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/11709776216.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a6101164ea5a903fcf763b09478aae06/50495907888.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdeb8503c2---55045341580.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe56330c26---zovonusilodelifomofumokug.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/lavig.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/44020665905.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/51003153737.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/keluxabigamovilupave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=postal+identity+card+application+form+pdfPDF 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_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 17328 bytes
SHA-256: fb33f8aa27979a8dda571ebb39d6179b71a94fabde2312c2ad597cf0ef4d1c88
font_02_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 10896 bytes
SHA-256: a13e0a7dd9d550ad09b63a5d7095eb39774939bec053cef16de3ddcba907e916

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