Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6dd3a6f9225027…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 12:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fc345c208268bad7f9855b2aca80533 SHA-1: cb3453dbbd46f96f2d2fdf8face8b2302ce760a4 SHA-256: 3f6dd3a6f9225027479d3c776bb3aed28e1bbee92df678438c781ed3e8efc813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which host other PDFs. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tkqabpiqqihiqgr77s0nallsid/nuzomidipiroxijofejisifid.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a42cb3e3---fotixixin.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/kifuwajibe.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/bogiwub.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/tufivevomunid.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/de7b80d132be168a7f4ebc73f300ea34/makid.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0eda6fc5d---toluwadapekonifegafezek.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/721179ab5f617a3648a9892b9808184c/40247026929.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1c890af48d55c9917e631175e6e82143/jamopitajufivitafawilezuj.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2854db7e---gapixejisogitifil.pdfIn PDF document text
    • http://brenderup.ro/mm/file/53795783043.pdfIn PDF document text
    • http://rayer.cn/d/files/vorimi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/49020112795.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2ede531823b7dba32e3a1d39a7346392/22240250799.pdfIn PDF document text
    • https://theurbanthinktank.com/files/21352014092.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/83161351923.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/xaxuper.pdfIn PDF document text
    • http://saydersan.com/firma/files/709015643.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/98690847460.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096dab1b9792---3629627717.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jc2rdfoc5jupijvbbb2f5psucb/39110246820.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ebome4nieo5h2c5q21t2i1bh9t/mudinenusoxabadezebov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=if+clause+type+0+1+2+worksheetPDF 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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 18180 bytes
SHA-256: d3d02ce93d73f64ccc8d6a33b3672c5e6960fad092376865446f050318af9f87
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 11016 bytes
SHA-256: c11b8a869e436a6eeb39408b7ae80d52e675c30ccac23e06096345726aefd3e0

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