Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb106aa1cb84bd3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 02:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f79e0f20da739405b29476bffa459692 SHA-1: 522e410738e9837e73d31b75a36e04f6700c59d7 SHA-256: 2fb106aa1cb84bd33a2b8b4209eedbdf2e7439df295ef14b9f5ad8688cbbd553
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials. The presence of embedded URLs and the heuristic firings suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://futuresbuilder.net/dayafter/uploadimages/newsimages/file/taxidowibonexopefudidenut.pdf In PDF document text
    • http://shiokuda1.com/contents/files/digisobamutatojawed.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/43114800169.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/135dmq6jucnqd5q8h4u6ia0eim/buvagevaganogiduxuxisar.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/juruzokewibabeduronatemez.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/77231172611.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/77844241859.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/lumegudabegejixowomozutoj.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/58941663397.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/dexinokak.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motapu.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/tilulatimibas.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/84787351658.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/bezijogufogurax.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/82759900995.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161490be8cd93b---dolunujimiwi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358127cf0cb---65346696743.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/tazajezuwetagobixetubekik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ad+free+video+player+for+androidPDF 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_off0000b176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 15944 bytes
SHA-256: ed42b643da651247c2d7e291e5b0c28c67050b960035a5e275ed2ea17ebf3e37
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10384 bytes
SHA-256: f4c0a4c61fcf8f95710f15d7aee7d490ab34067d132f0df630fb43305d85edec

Open this report in the interactive analyzer, or submit your own file for analysis.