Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b2d9530cefd9e…

MALICIOUS

PDF

90.4 KB Created: 2021-06-27 21:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1aedbd3172676c4f6a42bf9f3eb959ac SHA-1: 7776bea767cc84ee2fa23d2027e018ec4553f68b SHA-256: 538b2d9530cefd9ed595d59d25257ae0beb26a342763cedebb48b157b4b4e54a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a lure to download further malicious content. The PDF's structure and link farm characteristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://begemot-rus.com/uploadfiles/file/2021052408210273499.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c17e782---gukalosigazokadunitu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/42f5c59a826a83a53479d8d93e302c63/fudujivupaviraw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608637e7e84a1---niwokefe.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revezaxaxuf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5d2508f9---witunozagorekibaxoris.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8f95248fc2c7ff527b0e4f4dc32e5866/sipejati.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/88426050654.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dabelogerasesafegu.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/gegagubepe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab097b7ce1a---nodomune.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf6852b4b---dowularagonazevumovogam.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/59432352984.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c4a8088d---rikirigujone.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/732160a78aa9feac65618abadd626eab/93618296011.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e37cbb74aa1c36be5609357235bce82b/22959232295.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf8d6902f---80657393896.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/74968047484.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdf900a43---sovipamojuri.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/36370613654.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/66081446666.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7d7edac97cc0c2b35059b5cf51491ac2/goxanowebuxitux.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fc545646af1ad75dfabab7bb8e763281/fupurubebij.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/bizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mouth+under+tongue+swollenPDF link annotation
    • http://irodori.kir.jp/files/file/1781014777.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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 17912 bytes
SHA-256: a460d3248d35228c9d8206d3eb4be7bb89e1abe9f519f30aa1610354ae45d12b
font_01_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 10452 bytes
SHA-256: 133431e7b227ac6f71afb8380a12437f34c824362147482e21e3f3598fd71d2c
font_02_sfnt_off0001442f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.