Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddc421be78c2cc0…

MALICIOUS

PDF

80.6 KB Created: 2021-08-09 01:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52b516363c5a92e246bf1a5fa61fe0f8 SHA-1: 808c7ef4c5ad4973e9c9c29bde617e6c9344d595 SHA-256: fddc421be78c2cc013b3f3370be525227c34ced05dc80bc948bac2a493053320
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of embedded URLs and the 'QR code redirect lure' heuristic further support the attack pattern of directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hoangduy.vn/vn/files/14570292284.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/672f0f95d9ddbd6cd796048098ff0b04/7213803438.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/zozawiju.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/misavezigeb.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2c1f0467e7a87444ef330d53c8c16ec6/75524239116.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/7979497275.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaf590c594---zefupoxikagipizirofove.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/kipabigexitudupamakekez.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/31dc3c9a61eb554c3f448e8d43494188/gagebopot.pdfIn PDF document text
    • http://hidropro.hu/upload/99729757970.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087027fb7d0e---zimopafi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hacv0370f57plv2svv1pv5okhk/rodonegosokokukaxun.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/atf1pmj7osdk1ubbnv8gtvv58b/gilokil.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vcjs04q5v47hqtk9m6ituo129r/39718766773.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ff1be8a261a8cc23c497d56ad3a37962/guzujotisepono.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bufejegeraxurifok.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09077e6e6---70030014719.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6ecbju9l0ir3lqmujhfu5nqppe/gevorevatizadejowewi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/41904985103.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/liwesilinimumilenevokep.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/bomalop.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6c0bf358e5978ccbc00ce601c644135a/87754855999.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/9391665755.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/sesirubibisogogoxuwagebo.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/gaxelelemutaxozexil.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/48106637737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mgr+urimai+kural+mp3+songs+free+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_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 16960 bytes
SHA-256: 75c8e39b0041d297908584314eba7f9634140a8ced2b78d886f80a651919cbe9
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 11188 bytes
SHA-256: cf98281f8846ab157fa7724fe85a70c0631ac4d5d093a3c9744436fef829dca3