Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69544143aa0f3d9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 03:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb43eff2602338f3f11f3332918a90a4 SHA-1: 0f90a19a84e3251f6d41669ac6a6b2f89cd00925 SHA-256: f69544143aa0f3d9833cb1c6f4392c55aaea2aa9fc73ec41bd4643b33fd47c94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085663cef9a9---79647491756.pdf In PDF document text
    • http://apsara.ru/userfiles/file/79762828825.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/38827836683.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15932547321.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/98845393354.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/219a4072007e6e0e82104804a8bae42c/pizutiguvapufukin.pdfIn PDF document text
    • http://darec.sk/files/files/49828189792.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/80fdf3f78e1930158a42d9031bbc7481/57205794377.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3v8oqqa51fiqanlu3s6srd3a9h/32591217379.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eve9fnbtrukkr3fj6rrmdsctq6/zibibides.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ea5db4f5---gatikiwapasalexol.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/a3386722d842c298694695f992888f8b/58884667211.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/616a9dd19809e5ad68afa47207ea2422/41997280016.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd21ea773---xidosefetamabagidex.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/71321226148.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/wowepujala.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/56643294414.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/84555826940.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada54fbd3ec---kejibugitiberad.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/28860088384.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/26964498433.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/49304537123.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/dekaveguzozudax.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718752bf9c3---nimarejedurufade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=environmental+analysis+in+project+management+pdfPDF 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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 17164 bytes
SHA-256: 0bda810b3458d2d47d95f537d489558427479de9bc3b218504b86a900e1ec5d8
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11256 bytes
SHA-256: 09ceccc5a83ab128e41acdb35cbebdf191ddffeabb6f3be3a57fa48fe8812eb7
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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