Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1066c50c38c00cb…

MALICIOUS

PDF

83.3 KB Created: 2021-07-06 22:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b07b8e0a2b7370fe355582867be123a SHA-1: 013d065a29ca46fbf941f13a05256ee0fc1c7b7a SHA-256: a1066c50c38c00cbf0b588a53510adc864bdf017cff2dec200c5da830d079f8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shinies.ru/img/lib/file/lamudowokomoju.pdf In PDF document text
    • https://nutricount.cz/UserFiles/File/rubujoz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873fb02384d---65526744113.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xajejakulekonexamulix.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dd054a6da7377ba9391938f955b8d630/tejogajiduxakexedobarad.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6jk5ecg1mmi5u5rvk8kvagju51/61874270695.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210522144251148.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wuvanuwolabavudavonisa.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/dedazegabodepevi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/84107288843.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e116926d428---88475636766.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb473ba9093---89920842692.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996676638bd---nivokobefekuxabulawew.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/74772105966.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/puzotasasarujefuluxejukot.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087691a7be79---dajediwidejigexosijobivew.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/69520688726.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf07dd2c1f6.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jixunerim.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6710f1f5---nozigeworumegajil.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f20c5c5---67907262308.pdfIn PDF document text
    • http://elitvorota.ru/f/file/63493717563.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7h09siida8iafphu2kmcm0ar69/raxuwixapazimufanepib.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/37073409471.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a732c8699d---21246702504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stand+my+heroes+piece+of+truth+episode+1PDF 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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 11180 bytes
SHA-256: 95366e6bfa505ef535707c7c286f8eea315d0ab5aec93ad5b1b01db65ca51354
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 24088 bytes
SHA-256: a6af2cbbf3f338d956970f3deaddc1c94ae59368aa60d172c1ee8856afaafef8
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1