Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54df1274daceaac…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 09:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f20c6c3b1b19dcb2b41cd0c9307fbf3 SHA-1: bf8bf8d39ab1e20a86fe42d3b1593e71d3d38b32 SHA-256: b54df1274daceaac7e6eabe801766f27ae2cbf59f6cb5153d8511606cbe772be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to redirect users. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ji-tien.com/userfiles/file/lavajebosesezijejefer.pdf In PDF document text
    • https://club-sports.net/uploads/products/files/19105725424.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ked3300348i4aidp2aho4n1d8u/palevubugenajuxiwawe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c496f501d25---kosovigezawedor.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mupowezibu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc5a71678---xituxijiviwodamunovebek.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/48952848453.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/89c00345b0dc30ee29ff1af3f0598a60/kedenenusopi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/6978527689.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7804b673d6---71996117327.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/32815524998.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5rrsiu1tfoa64au3lj30jam3io/fibatodanumaze.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1mhqkt6m708u3q7ahu2kholgdl/23300553758.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/lubafujemuwalix.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/85106e08293b54be199f1e23cbdd824e/zufegimomideterow.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e95e1db7---pederofelifil.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/47437418461.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mi8n59visvkto1aq7uine0vef4/93778527723.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/3152358678.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160752840bff73---79234371174.pdfIn PDF document text
    • http://93564497.com/userfiles/95584923596.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/redupibopodufadabago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ataxia+cerebelosa+por+varicela+pdfPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/92888002588.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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 18108 bytes
SHA-256: 8d7d0e5e6bb5b85def486ac807b1c24e16d6a354b16ddb17a029382d8fceba4b
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 10800 bytes
SHA-256: 0befdf67731e390c90ae039154a9ff782cc4ab94d13753badb72d137a1d6e614