Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ab923870a547b2…

MALICIOUS

PDF

113.1 KB Created: 2021-07-29 23:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d2dd78286c3ad099475d12a7f9043966 SHA-1: 5ae7161c14d6a8a65a5277574bffe6f56e1c7068 SHA-256: d3ab923870a547b23271440df7286ad28ec16da731dd4daa466cf12879cfc15e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the heuristic firings confirm the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eced07282---kuxamejilubozasuja.pdf In PDF document text
    • http://taiwan-casters.com/userfiles/file/kikalojimakijivisasak.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/58508130664.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160755c163767b---52946931882.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ikke6nfn4bfsie891e9a15hl07/darotitev.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/168693d2e9e0905088e7bd37b0d3e8b8/xikijawapi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9efb70e23f192024f15cb12c1cc0680d/nuxipemekatiwe.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/mesadala.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/019949a4e7bc9f9b2a610b38d21829a8/4526576692.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/xonavuribofatipupafe.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/simanuwetekizotikex.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24724514122.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/31886846728.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/98207595493.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/sitinozujivojaka.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/28493042945.pdfIn PDF document text
    • http://championsview.net/userimages/266312857.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd340db072---31298865256.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1798d25ce4---vovanodojigasol.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917cf3d8b4b---mifixanimok.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/lvuvb21lokr28tsncnaq96lkeo/78330720455.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1f0e6b6f179fdcac47db71f72fdc80f5/83431516519.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/33638064661.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/67061758866.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gufaxuvugejuwaxofalug.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607506048dd24---94525714352.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2ac34383d562cdd4b5e372a38127319c/maranusomonali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+do+drill+sergeants+get+paidPDF 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_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D00 11140 bytes
SHA-256: 3ae1ee65ad54412017b7a049ee16e74a7ef3d39005a84222d1bfccec58919611
font_02_sfnt_off000186a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A2 17892 bytes
SHA-256: 48113fe6afab7d0febdd14692f027466350dfaf7648b48a4d28d0ac2db4d4b91

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