Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b652d50a1c11c4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 01:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cb74d42ec23164ea072baf8d0aabfce SHA-1: 186514616a86e12a657a6a1a07f024f65139dfa5 SHA-256: 25b652d50a1c11c48c16952fade1840e4faff38344194bd2930feabeb3fcb69a
164 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 a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of multiple URLs hosted on potentially compromised sites indicates an attempt to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807123b62cf---21651634117.pdf In PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/74131861536.pdfIn PDF document text
    • https://vitecolte.shop/file/31684140403.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/20729169146.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0760e0d58c---46137203601.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/47367526532.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/jomoponomaxa.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kaleged.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e70fca2d93---69471517982.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e6b424f7dba013090a94065d60d553cf/gatuk.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/96c2a4584e8acbdca3acfce3a4c535f6/wiruxukifuvokulaxamasup.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/8991789957.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4660df8c2ea87da5b6206cd03d8c8cad/lirebifobafumu.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dijejomixuduliwalixi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/dunezijufebizojiwajega.pdfIn PDF document text
    • http://gptools.net/userfiles/file/55247082084.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e0489998---pezojowaka.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740ddfba---44262519743.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ceddc52fb6aa953ddf71b02b3ec91910/kofositeweribazorosa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7e6dg965fmgv83krbh6bsfejpn/xajenokugozukulilifaporoz.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210701070203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=laptop+price+list+pdf+downloadPDF 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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 16604 bytes
SHA-256: 725a85b8f5f76e5a5b0e768312d1715fbc2ef974915ea8ceeb472745cd6f8620
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10656 bytes
SHA-256: f75d83de2f16473c204d5ae67ac1e3a681967d16fbb54cadcac80509147d9e32
font_02_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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