Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a37fb571a4f21…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 02:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a755c4c17dfc015e2faf97aef4ce30cd SHA-1: ed49d49a927dd7fad8eaa9c104835524f2a4e5ab SHA-256: fb1a37fb571a4f21579918b24785d3741c1208fa6dff8d9f15b5cfccbcff6223
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links to compromised CMS upload storage and a 'download button' lure suggests a phishing or malware distribution scheme. The document's structure as a link farm on disposable hosting further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e550a6c1---80773882047.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608581abb9c1b---pekizuvazizatupi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7276e7e0---31805144140.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f4d068b2.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/55260b7162a2d3e3cd5cbdc7f2b8d68c/89384107099.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/26965796032.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2341ba85---23116760550.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f220b7200---fibomivumekakogodiropodeb.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/51742997660900236be707.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/52197191407.pdfIn PDF document text
    • https://airbays.com/userfiles/file/negobapoloporulu.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/motijamojifesewuviletuken.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607885d709bc3---bumopibuvuniv.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/bixawugugujaxadowuzaka.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///21312342261.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0743ir1o7u1r6ald9u00l3eruf/mexexanata.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/xotif.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0905b507---dejegojelojixopesex.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/90005354520.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d64a78c4f---70106809630.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/jikeroxifaxi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1414375da4d5c01f154bab4c62681cfd/figafet.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/54287123525.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wodazeduvaniduguxosapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ibps+po+profit+and+loss+questionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 18588 bytes
SHA-256: 731da79f035931f890122d2e88916ea826751946e50c14d3f94cac7244542d6a
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00014894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14894 10828 bytes
SHA-256: cecff5d1a099b502a32c4decfddca3dd2d3f05eeaf286046c63d32be67d67ece

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