Malicious PDF — malware analysis report

Static analysis result for SHA-256 27db19289bae00f1…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ebb57c3e475566b61e63ac788f7620fc SHA-1: cc450c2602599e8ab0211dbd1aee024bf49d37cb SHA-256: 27db19289bae00f1fa45fd3a6db7724f68a229ac0b076d00e97fca7dc73d1d0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute further malicious content or phish for information. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/egb2s7mbpfab5t7iqdhppm4bjm/dalikizapesegafibekowipi.pdf In PDF document text
    • http://ashioke.com/images/library/File/sogivul.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741ea29d86d---xibos.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/58ea00c106df70e03d710b90ca32950a/53182443214.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/nigepiruzotoledufoxobugo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/954af0235285f4daf8dd70c52fd79c78/mutilivagakafupu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/edc0dfe7090c593f5f81301e61641188/vowofo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/88a9aace077d4269c2fae7e4691a6224/14946143682.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/70523380938.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721468cd56---62931230856.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0592aaf1d---58668879493.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/48322650008.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/sifonuz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ccc08a98288ed104f0158d8a28b6fb8/zexug.pdfIn PDF document text
    • http://primaneighbors.com/userimages/62485323301.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bb891b3---28616887112.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9450c9343---vamenomikaruvonewa.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6lf1i8b7up3mp5suqc2itr6ki6/revofapemolukavirizune.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3uolvt9nspm41ahil667r780nf/katuk.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0df77552a9b3dc7ec56ea3b675a35926/vimabivi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64404221b5---18232167655.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160848608e9d5a---44394025810.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/30a31a6b7a9cf809f432a869672b4fa9/dunodadipenetavisikuloro.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/n6md150964pr3ldo1vo0oh82m5/busadojososipeteduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=limitation+of+liability+clause+ukPDF 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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 16944 bytes
SHA-256: db54c120d7a787b3accad95d0c1e3a9043bdb50cdfa2f3894c4f74ddaf1c84d0
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 10800 bytes
SHA-256: f3c315d9930c50e7e68c17aaf930708217b0d0c144facf959e5d4496a912a829

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