Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a6930c34fd8ace…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 13:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4a39efcba45c984f6fb5fa7f5f9c2a46 SHA-1: 057f400f04bd23f38ebd074ffa7ff7a74483f2fb SHA-256: 39a6930c34fd8acef871f6897d99cd5821bdd11a4d7f1a024037d64f264cc19a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The file's structure as a link farm on compromised infrastructure supports its role in distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3d5c1a9c4033d0405f5bf8c5876e77bf/mufisutaxezif.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49c04e145---tarukazovadiwomo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16118df89c6a0b---98292535117.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/kuwer.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ce66c8e9b66b67e07b662c26ec4668bd/felinijitetixewobamew.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/42195669228.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fatewozubosut.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/55539157963.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/74013103701.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/fejawalorigufulebolafow.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/30342967754.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464050aca4---xagamenigukolusojed.pdfIn PDF document text
    • https://austarpharma.com/upload/files/1169392320.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d730b7eef7---21642991889.pdfIn PDF document text
    • https://ckmandarin.com/uploads/31789427416.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f1685ba0a3c4374738492ba126db1a62/fekezuzofitode.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/fixopedetalenajesob.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/be2538a4957e172e171811d6b9a7577f/53846246264.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/51117057780.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/19530224904.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/telokukosula.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/4699436823.pdfIn PDF document text
    • http://htwy.com/upload/file/45945585637.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/69b4cc055b481f15c8c4b0c203583abe/10581734097.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2olar5t61ufkhefgo774jp02l4/30557799516.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vulagotoxinukop.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/56020220560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=proofreading+marks+chicago+manual+of+stylePDF 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 11228 bytes
SHA-256: 5793056c4c7d4e0edc3e60d577072966d9752f8d09927cf8f8b4d32f1c42ed39
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 18532 bytes
SHA-256: c95aa2008f7930a32f90bed56a7715d332beb98550cd01509f3ce532bafe9f36

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