Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15f1cb61e3c0df8…

MALICIOUS

PDF

130.6 KB Created: 2021-07-07 01:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de9194693cc1c7ac4ba3ed48eb0592a3 SHA-1: e17edddb2b781101becff70242068cb1a71fcce0 SHA-256: c15f1cb61e3c0df8cc5c7068693c89e0945b701ca0e7bd3fb5e66d91dc92e243
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests the document is designed to lure users to these sites, likely for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3829719d16---4729293434.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5162b8e1---36667863675.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed97d1dae---6103339587.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a3ee72147a2cd2d6f2df4e459d8d7585/mebivamo.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/junigux.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dinamifulosutuxasifivebu.pdfIn PDF document text
    • https://people11people.com/uploads/File/gixomaz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878bf504205---34851991371.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/wivuv.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1e6b7a529d58f0a133871719c0890472/kewoxeribizujezufukadoto.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/keguferedam.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/43191422243.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad621135e---42964729480.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e10e0b7c983276af2f7465c18ef2509d/24644575877.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m9ciuo50sd1lr8atelbofbbcl3/8692459466.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l7iieqg132u61t8q98s87aofb2/36444112325.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/96614186496.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/434a02e6f241b193e69c4cc0672e3769/17653017210.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f5f7cf97---givojanijutivuvoj.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424f96dc96---sofokatipoxitosowu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ata8qnfbr97nipinsj3lqegrfc/26179362669.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b30055d9be8---xomugupez.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/95385402498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pisces+pronounce+in+englishPDF 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_off00015784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15784 17516 bytes
SHA-256: 53a4b8d9cde77431c3e88f87f9ab2db094dfdfb95ee44a5278b5883f7e5b72b6
font_01_sfnt_off0001723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723A 36476 bytes
SHA-256: da96beb47c685e8665ddda86758bd9983ac13a68abb09bde84fc180320c8e78f
font_02_sfnt_off0001cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB64 10492 bytes
SHA-256: 945676e94e519cf33705852f11295e0d72bae7806d897d34911b65b0b05c1b7d
font_03_sfnt_off0001e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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