Malicious PDF — malware analysis report

Static analysis result for SHA-256 822f648194d296e3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 14:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d1ae7a7992f18effd398db0d50fd6e3 SHA-1: 0d895d4d53e36b8fa2d4294e80772e398db6dc96 SHA-256: 822f648194d296e32b1c457426da437f3c25a7beccf233b8ef82d9535ea31438
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. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to manipulate search engine results or lead users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brenno-tojestto.pl/userfiles/file/75850749459.pdf In PDF document text
    • http://nbnjl.com/userfiles/files/kotebugazi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d3b30003e8a17bb750ec13b2c99a1403/1976975510.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lezofobokavovuduw.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2q2ct9hf116hmfl4rjtu6qggj4/pugavetidopijazewi.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/17360285542.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fabetowuresidaziwazuv.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zuwuwodazike.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/90821798719.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5e365e69---jelatawarukikodab.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/41139059706.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/mozugofozaxuva.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ggadrvj8mid49717fslsliljh6/mevodofavofewixorobi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99794a95624502e69f943043cdbf8da3/19220014597.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xiwibonaxepobigap.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2851f68d---nizopipugafenulinaze.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/goxuwewanowopuw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/rololijat.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/fixizopunotirojemoboxow.pdfIn PDF document text
    • https://edarky.net/data/file/27897197941.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nodupaxiwikixuduw.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5af0d3699---25250205693.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab3db14f2---belomukupururafilun.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/fivafumijosunafeloguvugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=human+papillomavirus+and+cervical+cancer+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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 17784 bytes
SHA-256: df574fe7a7ef5cfe838a2870cd41d9d811d6433f4685a1808d43862d89c3f36b
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 10840 bytes
SHA-256: a7dc25448af2677e3ff3402b6a48c4b4854f9f573565e2d552df3299b2ad8794
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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